Treatment system for coking phenol-cyanogen wastewater

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a coking phenol-cyanogen sewage treatment system, which comprises a pretreatment stage, a biochemical treatment stage and an advanced treatment stage, a mixing cavity, a flotation cavity, a separation cavity, a scum cavity and a clear water cavity are sequentially formed in the air flotation tank; the scraping plate is movably connected to the upper part of the separation cavity and is used for scraping dross; the recovery valve pipe is arranged below the clear water cavity, and a concentration sensor is arranged in the recovery valve pipe and used for detecting the impurity concentration in the clear water; according to the coking phenol-cyanogen sewage treatment system, the scraping depth of the scraping plate is correspondingly adjusted according to the concentration value of the impurities at the clear water, and the larger the amount of scum in the separation cavity is, the larger the downward moving speed of the corresponding scraping plate is, so that the scum in the separation cavity can be thoroughly and effectively scraped and recycled by the scraping plate.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and specifically relates to a treatment system for coking phenolic cyanide sewage. Background Art

[0002] Coking phenolic cyanide sewage is a kind of high-concentration and difficult-to-degrade organic sewage generated during the production process of coking enterprises, mainly containing pollutants such as phenols, cyanides, sulfides, ammonia nitrogen, polycyclic aromatic hydrocarbons, and nitrogen-containing heterocyclic compounds. The coking phenolic cyanide sewage treatment system usually consists of a pretreatment system, a biochemical treatment system, a deep treatment system, a sludge treatment system, etc.

[0003] Chinese invention patent CN116715304B discloses a high-efficiency air flotation pretreatment device for coking wastewater and its treatment method, belonging to the technical field of coking wastewater treatment. The device includes an air flotation tank, a bubble generating device arranged in the air flotation tank, a water inlet pipe and a water outlet pipe communicated with the air flotation tank. One end of the cylinder is rotationally connected to the output end of the blower through a hollow pipe, and the other end of the cylinder is connected to the output end of the first motor; the treatment efficiency of this coking phenolic cyanide sewage treatment system is low and the treatment effect is poor.

[0004] Chinese invention patent CN115321764B provides a treatment system and method for coking wastewater, belonging to the technical field of wastewater treatment. The treatment system includes an oil separation tank, a first air flotation tank, an adjustment tank, a composite hydrolysis acidification tank, a second air flotation tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a denitrification filter, and a coagulation reaction system connected in series from front to back; the operation difficulty of this coking phenolic cyanide sewage treatment system is large and the operation accuracy is low.

[0005] When the existing air flotation tank pre-treats coking phenolic cyanide sewage, when the scum concentration in the clear water increases, it means that there is too much scum on the liquid surface of the air flotation tank and the scum accumulates. The scraping depth of the scum by the scum scraping part is insufficient and some scum is discharged with the clear water, thus affecting the recovery quality of the clear water; when the scum concentration in the clear water decreases, it means that there is too little scum on the liquid surface of the air flotation tank. The scraping depth of the scum by the scum scraping part is too large and some clear water and scum are discharged together, thus reducing the recovery amount of the clear water.

[0006] At the same time, when the scraping depth of the scum by the scum scraping part changes, the area of the scum attached to the surface of the scum scraping part changes correspondingly. If the attached scum cannot be completely and effectively removed, the scum attached to the outer surface of the scum scraping part is likely to affect the subsequent removal of the scum.

[0007] Meanwhile, as the slag scraping part continuously moves and enters the inside of the air flotation tank to scrape the floating slag, the slag scraping part directly inserts into the inside of the air flotation tank and easily causes turbulence on the liquid surface, or the slag scraping part directly squeezes and contacts the outer surface of the floating slag, causing the tiny bubbles adsorbed on the outer surface of the floating slag to collide and break with each other, and ultimately reducing the scraping effect on the floating slag. Summary of the Invention

[0008] In view of the above problems, the present invention provides a treatment system for coking phenolic cyan wastewater.

[0009] To achieve the above object, the present invention provides the following technical solution: A treatment system for coking phenolic cyan wastewater, comprising: a pretreatment stage, a biochemical treatment stage, and a deep treatment stage, wherein the pretreatment equipment includes: An air flotation tank, which flotation-treats coking phenolic cyan wastewater, and a mixing chamber, a flotation chamber, a separation chamber, a floating slag chamber, and a clear water chamber are successively arranged inside the air flotation tank; A scraper, which is movably connected above the separation chamber and scrapes the floating slag; A recovery valve pipe, which is arranged below the clear water chamber. A concentration sensor is arranged inside the recovery valve pipe and is used to detect the impurity concentration in the clear water. When the concentration value detected by the concentration sensor is greater than the set concentration preset value, the scraping depth value of the floating slag inside the separation chamber by the scraper is adjusted to increase.

[0010] The concentration sensor inside the recovery valve pipe is used to detect the impurity concentration in the clear water in real time, and the scraping depth of the floating slag by the scraper is correspondingly adjusted, so as to ensure that all the floating slag inside the air flotation tank can be thoroughly and accurately scraped and recovered, avoiding reducing the subsequent treatment quality of the clear water; at the same time, the self-cleaning distance can also be adjusted according to the scraping depth of the floating slag by the scraper, avoiding the influence of residual floating slag on the outer surface of the scraper on subsequent slag scraping; when the scraper rotates and inserts into the air flotation tank, the moving and rotating directions of the scraper are opposite and offset, thereby reducing the collision and extrusion force between the scraper and the clear water and floating slag inside the air flotation tank, avoiding the crushing of tiny air flotation on the outer surface of the floating slag and reducing the scraping effect.

[0011] Preferably, a plurality of partition plates are evenly arranged inside the air flotation tank. The partition plates are arranged between adjacent two chambers of the mixing chamber, the flotation chamber, the separation chamber, the floating slag chamber, and the clear water chamber and are used to divide each chamber. A plurality of bottom through holes are evenly arranged below the inner part of the partition plate between the mixing chamber and the flotation chamber, and the bottom through holes are used to circulate the wastewater mixed with the flocculant inside the mixing chamber to the bottom of the flotation chamber. A flow dividing plate is arranged above the partition plate between the flotation chamber and the separation chamber, and the flow dividing plate divides the flotation-treated floating slag and clear water. A plurality of water outlet holes are evenly arranged below the inner part of the partition plate between the floating slag chamber and the clear water chamber, and the water outlet holes are used to allow the clear water below the separation chamber to enter the clear water chamber along the lower part of the floating slag chamber for subsequent treatment.

[0012] Preferably, it includes: A water inlet pipe through which sewage flows inside and the output end of which is connected to the inside of the mixing chamber through a pump body; A medicine tank part which is arranged on one side of the air flotation tank and the flocculant inside is connected to the inside of the water inlet pipe through the pump body at the output end; An air dissolving tank which is arranged on one side of the air flotation tank and injects air-dissolved water into the flotation chamber, and one end of the air dissolving tank is connected to the output end of an air compressor, the other side of the air dissolving tank is connected to a reflux pipe through an air dissolving water pump, and the other end of the reflux pipe is connected to the inner bottom of the clear water chamber.

[0013] Preferably, it further includes: Rotating rods, a plurality of which are arranged and all are movably connected inside the mixing chamber, a stirring motor is arranged at the top of the rotating rod, and the peripheral side of the stirring motor is fixedly connected to the top of the air flotation tank through a bracket; Blades, a plurality of which are arranged and all are movably connected to the outer surface of the rotating rod, and the rotating rod drives the blades to rotate and uniformly mix the sewage and the flocculant inside the mixing chamber.

[0014] Preferably, it further includes: Injectors, a plurality of which are arranged and all are located at the inner bottom of the flotation chamber, the bottoms of the plurality of injectors are interconnected through a shunt pipe, and the center of the shunt pipe is connected to the output end of the air dissolving tank through an air supply pipe; Nozzles, a plurality of which are arranged and uniformly distributed at the output end of the injector, and the air-dissolved water inside the injector is uniformly ejected along the nozzles to perform flotation on the sewage inside the flotation chamber.

[0015] Preferably, a plurality of side plates are evenly arranged on both sides of the air flotation tank, a telescopic part is arranged at the top of the side plate, a follower plate is arranged at the output end of the top of the telescopic part, the telescopic part is started to drive the follower plate to move up and down, a splicing frame is movably connected above the follower plate, the splicing frame is connected to a scraper for installation, and the scraper moves synchronously with the splicing frame.

[0016] Preferably, a driving motor is arranged at the top of one of the follower plates, a driving gear is arranged at the output end of the driving motor, a central shaft is rotatably connected to the top of the follower plate through a bearing seat, a plurality of transmission gears are evenly arranged on the outer surface of the central shaft, a conveyor belt is connected in a transmission manner to the outer surfaces of two transmission gears on the same side, the bottom of the splicing frame is inserted and connected to the conveyor belt through a mounting block, the central shaft rotates to drive the conveyor belt to rotate through the transmission gears, the conveyor belt drives the scraper to rotate, a driven gear is arranged on the outer surface of one of the central shafts, and a chain is connected in a transmission manner to the outer surfaces of the driving gear and the driven gear.

[0017] Preferably, it further includes: Inclined discharge plate, the inclined discharge plate is located on the side of the partition between the separation chamber and the scum chamber close to the separation chamber, and the inclined discharge plate is inclined to separate scum and clear water; Impurity removal valve pipe, the impurity removal valve pipe is connected to one end of the scum chamber and discharges scum; Mounting frame, the mounting frame is fixedly connected above the inclined discharge plate and has an inverted L-shaped structure; Demountable plate, the demountable plate is movably connected below the mounting frame and scrapes and cleans the outer surface of the scraper.

[0018] Preferably, it further includes: Fixed plate, the fixed plate is arranged inside the partition between the scum chamber and the clear water chamber on the side close to the clear water chamber; Drainage port, the drainage port is opened above the inside of the fixed plate, and a movable plate is hermetically and movably connected inside the drainage port. The moving distance of the movable plate inside the drainage port changes the opening size of the drainage port and is used to adjust the liquid level height inside the dissolved air flotation tank.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, the treatment system for coking phenol-cyanide wastewater adjusts the scraping depth of the scraper according to the concentration value of impurities in the clear water, and the greater the amount of scum in the separation chamber, the greater the downward movement rate of the corresponding scraper, so as to ensure that the scraper can thoroughly and effectively scrape and recover the scum in the separation chamber, and avoid the influence of too much or too little scum on the quality of the subsequent clear water.

[0020] 2. In the present invention, when adjusting the scraping depth of the scum by the scraper in the treatment system for coking phenol-cyanide wastewater, the scraping distance from the demountable plate is correspondingly adjusted to further avoid the influence of scum attached to the outer surface of the scraper on the subsequent scum scraping.

[0021] 3. In the present invention, when the scraper in the treatment system for coking phenol-cyanide wastewater enters the liquid level inside the separation chamber, it adaptively adjusts to reduce the insertion rate of the scraper into the liquid level, further avoiding the scraper causing turbulence in the liquid level inside the separation chamber and squeezing and crushing the scum. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the front view axonometric three-dimensional structure schematic diagram of the present invention; Figure 2 is the rear view axonometric three-dimensional structure schematic diagram of the present invention; Figure 3 is the front view internal axonometric three-dimensional structure schematic diagram of the present invention; Figure 4 is the partial three-dimensional structure schematic diagram of the dissolved air tank of the present invention; Figure 5 is the partial three-dimensional structure schematic diagram of the rotating rod of the present invention; Figure 6Schematic three-dimensional structure diagram of the ejector part of the present invention; Figure 7 Schematic exploded three-dimensional structure diagram of the scraper part of the present invention; Figure 8 Schematic exploded three-dimensional structure diagram of the drain port part of the present invention.

[0023] In the figure: 1. Air flotation tank; 2. Mixing chamber; 3. Flotation chamber; 4. Separation chamber; 5. Scum chamber; 6. Clear water chamber; 7. Escalator; 8. Air compressor; 9. Dissolved air tank; 10. Return pipe; 11. Chemical tank part; 12. Water inlet pipe; 13. Support; 14. Stirring motor; 15. Rotating rod; 16. Blade; 17. Air supply pipe; 18. Shunt pipe; 19. Ejector; 20. Nozzle; 21. Dissolved air water pump; 22. Shunt plate; 23. Side plate; 24. Telescopic part; 25. Follow-up plate; 26. Bearing seat; 27. Driving gear; 28. Chain; 29. Driving motor; 30. Driving gear; 31. Driven gear; 32. Central shaft; 33. Conveyor belt; 34. Mounting block; 35. Splicing frame; 36. Scraper; 37. Inclined discharge plate; 38. Water outlet hole; 39. Fixed plate; 40. Drain port; 41. Movable plate; 42. Threaded rod; 43. Threaded sleeve; 44. Adjusting motor; 45. Mounting frame; 46. Demounting plate; 47. Recovery valve pipe; 48. Impurity removal valve pipe; 49. Discharge valve pipe; 50. Bottom perforation; 51. Partition board; 52. Cross frame. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0025] As Figures 1-8 shown, a treatment system for coking phenol-cyanide wastewater is mainly used for gradually refining the phenol-cyanide wastewater generated by coking. The coking phenol-cyanide wastewater contains phenolic compounds, nitrogen-containing heterocyclic compounds, polycyclic aromatic hydrocarbons, other organic matters, ammonia nitrogen, sulfides, cyanides, fluorides, heavy metals, oils and fats, suspended solids, and clear water, etc. Multiple devices are required to gradually treat it, specifically including the following steps and related devices involved: 1. Pretreatment stage: Oil removal treatment. The wastewater first enters the gravity oil removal tank, and the floating oil in the wastewater is separated by gravity. Water quality adjustment. The wastewater after oil removal flows into the adjustment tank, where the incoming water is evenly stirred by a submersible aerator in the adjustment tank to adjust the water quality and quantity, making the subsequent treatment process more stable. Air flotation treatment. The wastewater is conveyed to the jet air flotation machine by a lift pump. A large number of tiny bubbles are generated through devices such as a dissolved air pump. The bubbles adsorb suspended solids, colloids and other impurities in the wastewater and float to the water surface to form scum, which is scraped off by a scum scraper, so as to achieve the purpose of removing impurities.

[0026] 2. Biological treatment stage: Anaerobic biological treatment. The wastewater enters the anaerobic biofilm reactor, which contains carbon fiber composite fillers. Macromolecular organic matter is acidified and degraded into small molecular organic matter under the action of anaerobic microorganisms. Anoxic biological treatment. The wastewater enters the anoxic biofilm reactor, and the internal carbon fiber fillers provide an attachment carrier for microorganisms. The microorganisms use the incoming organic matter as a carbon source and the nitrate nitrogen in the recirculated water as an oxygen source to carry out denitrification and ammonia removal reactions to remove ammonia nitrogen in the wastewater. Aerobic biological treatment. The wastewater enters the aerobic bioreactor. Through forced aeration, microorganisms decompose organic matter under aerobic conditions to further remove pollutants such as COD and ammonia nitrogen in the wastewater.

[0027] 3. Advanced treatment stage: Coagulation and precipitation. The wastewater enters the coagulation reaction tank, and coagulants such as PAC are added to aggregate tiny suspended particles, colloids and other impurities in the wastewater into larger particles, and then flow into the inclined plate sedimentation tank for sedimentation separation. Filtration treatment. The wastewater passes through ceramic membrane filters, ultrafiltration devices, nanofiltration devices and reverse osmosis devices, etc. for filtration, oil removal, intercepting impurities and removing salts, etc., to further improve the water quality.

[0028] Therefore, when actually treating coking phenol-cyanide wastewater, the air flotation machine can treat suspended solids, oils and some organic matters in it, so as to improve the effect of the above pretreatment stage and ensure the effects of subsequent biological treatment and advanced treatment of the wastewater.

[0029] Therefore, the pretreatment device in the coking phenol-cyanide sewage treatment system includes: an air flotation tank 1. The air flotation tank 1 performs flotation treatment on coking phenol-cyanide sewage. Inside the air flotation tank 1, there are successively arranged a mixing chamber 2, a flotation chamber 3, a separation chamber 4, a scum chamber 5, and a clear water chamber 6. Then, the sewage undergoes mixing, air flotation, and scum scraping treatment inside the air flotation tank 1. Specifically, the sewage enters the mixing chamber 2 and is fully stirred and mixed with a flocculant to flocculate fine impurities into larger impurities. At this time, the sewage continues to enter the flotation chamber 3. Dissolved air water is continuously sprayed inside the flotation chamber 3. This dissolved air water is tiny bubbles, and these tiny bubbles can adhere to the outer surface of the flocculated impurities and increase the buoyancy of the impurities. Then, driven by the buoyancy of the tiny bubbles, the scum floats on the upper surface, while the clear water is located below and is stratified. At this time, both the clear water and the scum enter the separation chamber 4, and the scum on the upper part of the separation chamber 4 is scraped into the scum chamber 5 by means of a scum scraping part, while the clear water continuously enters the clear water chamber 6 along the lower part of the separation chamber 4 for recovery, thus realizing the air flotation treatment process of the sewage.

[0030] Specifically, a plurality of partition plates 51 are evenly arranged inside the air flotation tank 1. The partition plates 51 are arranged between adjacent two chambers of the mixing chamber 2, the flotation chamber 3, the separation chamber 4, the scum chamber 5, and the clear water chamber 6 and are used to divide each chamber. Therefore, each chamber forms an independent chamber under the partitioning action of the partition plates 51, ensuring the treatment effect of the sewage inside each chamber. A plurality of bottom through holes 50 are evenly opened below the partition plate 51 between the mixing chamber 2 and the flotation chamber 3. The bottom through holes 50 are used to flow the sewage mixed with the flocculant inside the mixing chamber 2 to the bottom of the flotation chamber 3. That is, after the sewage and the flocculant are fully mixed and stirred inside the mixing chamber 2, they enter the lower part of the flotation chamber 3 along the bottom through holes 50. The setting position of the bottom through holes 50 further improves the adsorption and floating effect of the dissolved air water sprayed inside the flotation chamber 3 and the flocculated impurities.

[0031] Above the partition plate 51 between the flotation chamber 3 and the separation chamber 4, there is a flow dividing plate 22. The flow dividing plate 22 divides the flotation-treated scum and clear water. The flow dividing plate 22 is arranged obliquely upward from the flotation chamber 3 to the separation chamber 4. Therefore, the impurities after flotation inside the flotation chamber 3 are located above and enter the upper part of the separation chamber 4 along the flow dividing plate 22, while the clear water flows stably backward inside the separation chamber 4 after passing over the flow dividing plate 22. A plurality of water outlet holes 38 are evenly opened below the partition plate 51 between the scum chamber 5 and the clear water chamber 6. The water outlet holes 38 are used to introduce the clear water below the separation chamber 4 into the clear water chamber 6 for waiting for recovery. The scum scraping part continuously works and scrapes the scum on the upper part of the separation chamber 4 into the scum chamber 5 for subsequent treatment, and the clear water inside the separation chamber 4 can continuously enter the clear water chamber 6 along the water outlet holes 38 for recovery, thus completing the air flotation treatment process of the sewage.

[0032] Meanwhile, the coking phenol-cyanide sewage treatment system further includes: a water inlet pipe 12 through which sewage flows internally, and the output end of the water inlet pipe 12 is connected to the inside of the mixing chamber 2 through a pump body. That is, after the pump body is started, the sewage is introduced into the mixing chamber 2 along the water inlet pipe 12 and waits for subsequent mixing and stirring; a medicine tank part 11 is arranged on one side of the air flotation tank 1, and the flocculant inside the medicine tank part 11 is connected to the inside of the water inlet pipe 12 through the pump body at the output end; a water adding port and a medicine adding port are provided inside the medicine tank part 11, and a conventional stirring device is also provided at an eccentric position. Then, the stirring device is started to mix the flocculant inside the medicine tank part 11 and reach the required concentration. After that, the pump body is started to introduce the flocculant into the water inlet pipe 12 and enter the mixing chamber 2 together with the sewage inside the water inlet pipe 12 for subsequent mixing and stirring treatment.

[0033] A dissolved air tank 9 is arranged on one side of the air flotation tank 1 and introduces dissolved air water into the flotation chamber 3. The dissolved air tank 9 is the core component of this air flotation device. It mainly mixes clear water and gas to form the required dissolved air water. This dissolved air water can adsorb and float the impurities flocculated inside the flotation chamber 3, thereby realizing the flotation process of the impurities. One end of the dissolved air tank 9 is connected to the output end of an air compressor 8, and the air compressor 8 is also fixedly connected to the side wall of the air flotation tank 1. The input end of the air compressor 8 can be directly connected to the air, or the input end of the air compressor 8 is connected to an ozone generator. Then, the generated air or ozone, etc., enters the dissolved air tank 9 under the air compression of the air compressor 8 and waits for subsequent mixing with the clear water. The other side of the dissolved air tank 9 is connected to a return pipe 10 through a dissolved air water pump 21, and the other end of the return pipe 10 is connected to the inner bottom of the clear water chamber 6. Then, when the dissolved air water pump 21 is started and applies a suction force to the return pipe 10, the clear water inside the clear water chamber 6 enters the dissolved air tank 9 along the return pipe 10 and combines with the air or ozone to form dissolved air water, which is convenient for the subsequent air flotation effect of the dissolved air water.

[0034] And the coking phenol-cyanide sewage treatment system further includes: a rotating rod 15, and a plurality of rotating rods 15 are arranged and are all movably connected to the inside of the mixing chamber 2. The rotating rod 15 rotates to fully and effectively mix and stir the sewage and the flocculant inside the mixing chamber 2. A stirring motor 14 is arranged at the top of the rotating rod 15, and the circumferential surface of the stirring motor 14 is fixedly connected to the top of the air flotation tank 1 through a bracket 13; when the stirring motor 14 is started, the output end drives the rotating rod 15 to rotate, and blades 16, and a plurality of blades 16 are arranged and are all movably connected to the outer surface of the rotating rod 15. The rotating rod 15 drives the blades 16 to rotate and evenly mix the sewage and the flocculant inside the mixing chamber 2. With the rotation of the blades 16, the mixing and stirring effect is further improved, so as to ensure that the impurities in the sewage can be fully mixed with the flocculant and form larger impurities, which is convenient for the subsequent flotation process.

[0035] Meanwhile, the coking phenol-cyanide sewage treatment system further includes: ejectors 19. A plurality of ejectors 19 are provided and are all located at the bottom inside the flotation chamber 3. The ejector 19 is the main emission unit of the dissolved air water. Its internal structure is stable, and it can divide bubbles in the dissolved air water into multiple tiny structures. These tiny bubbles facilitate the adsorption and floating of the flocculated impurities inside the flotation chamber 3. The bottoms of the plurality of ejectors 19 are interconnected with each other through a shunt pipe 18. The center of the shunt pipe 18 is connected to the output end of the dissolved air tank 9 through an air supply pipe 17. Then, the dissolved air water generated by the dissolved air tank 9 uniformly enters the interiors of the plurality of ejectors 19 along the air supply pipe 17 and the shunt pipe 18, thereby improving the subsequent spraying effect of the dissolved air water inside the ejector 19. Nozzles 20. A plurality of nozzles 20 are provided and are evenly distributed at the output end of the ejector 19. The dissolved air water inside the ejector 19 is evenly ejected along the nozzles 20 and performs flotation on the sewage inside the flotation chamber 3. The setting of the nozzles 20 further improves the uniformity of the ejection of the dissolved air water, avoids the adsorption dead angle of the flocculated impurities inside the flotation chamber 3, and reduces the treatment effect on the sewage.

[0036] The coking phenol-cyanide sewage treatment system further includes: a scraper 36. The scraper 36 is movably connected above the separation chamber 4 and scrapes off the floating scum. Specifically, the scraper 36 is a rectangular plate-like structure made of rubber material. The scraper 36 continuously reciprocates inside the separation chamber 4 and realizes the scraping and cleaning effect of the floating scum above the separation chamber 4. A plurality of side plates 23 are evenly provided on both sides of the air flotation tank 1. The side plates 23 mainly play a role of fixing and supporting. A telescopic part 24 is provided at the top of the side plate 23. The telescopic part 24 can be a structure such as an electric telescopic rod, and the output distance thereof can be adjusted correspondingly. A follower plate 25 is provided at the top output end of the telescopic part 24. Therefore, when the telescopic part 24 is started, it drives the follower plate 25 to move up and down, further adjusting the height value of the follower plate 25. A splicing frame 35 is movably connected above the follower plate 25. The side wall of the splicing frame 35 is fixedly connected to the scraper 36. The scraper 36 moves synchronously with the splicing frame 35. When the telescopic part 24 is started, the output end drives the follower plate 25 to move up and down. The follower plate 25 drives the scraper 36 to move up and down through the splicing frame 35, thereby realizing the adjustment of the height value of the scraper 36.

[0037] A driving motor 29 is provided at the top of the follower plate 25 on one side. A driving gear 30 is provided at the output end of the driving motor 29. When the driving motor 29 starts and drives the driving gear 30 to rotate, the top of the follower plate 25 is rotatably connected to a central shaft 32 through a bearing block 26. A plurality of transmission gears 27 are evenly provided on the outer surface of the central shaft 32. A conveyor belt 33 is drivingly connected to the outer surfaces of two transmission gears 27 on the same side. When the central shaft 32 rotates, it synchronously drives the transmission gears 27 on both sides to rotate. The transmission gears 27 drive the conveyor belt 33 to transmit. The bottom of the splicing frame 35 is inserted and drivingly connected to the conveyor belt 33 through a mounting block 34. Therefore, when the central shaft 32 rotates, it drives the conveyor belt 33 to rotate through the transmission gears 27. The conveyor belt 33 drives the scraper 36 to rotate. The scraper 36 continuously reciprocates above the separation chamber 4. When the scraper 36 is located below the conveyor belt 33, the transmission direction is the same as the flow direction of the floating slag and clear water inside the separation chamber 4 and the transmission speed is high. Thus, the floating slag above the separation chamber 4 can be scraped and cleaned by means of the scraper 36, realizing the efficient separation of the floating slag and clear water. A driven gear 31 is provided on the outer surface of the central shaft 32 on one side. The outer surfaces of the driving gear 30 and the driven gear 31 are drivingly connected by a chain 28. When the driving gear 30 rotates, it synchronously drives the driven gear 31 to rotate through the chain 28. The driven gear 31 drives the central shaft 32 to rotate, thereby realizing the above-mentioned effect of the scraper 36 driving and scraping.

[0038] The coking phenol-cyanide sewage treatment system further includes: an inclined discharge plate 37. The inclined discharge plate 37 is located on the side of the partition 51 between the separation chamber 4 and the floating slag chamber 5 close to the separation chamber 4. The inclined discharge plate 37 is arranged obliquely upward from the separation chamber 4 to the floating slag chamber 5. The inclined discharge plate 37 is inclined to separate the floating slag and clear water. An impurity removal valve pipe 48. The impurity removal valve pipe 48 is connected to one end of the floating slag chamber 5 and discharges the floating slag. The impurity removal valve pipe 48 is located at the inclined lower end of the floating slag chamber 5. The floating slag chamber 5 is inclined to facilitate the rapid sliding and recovery of the internal floating slag. Therefore, the floating slag gradually enters the interior of the floating slag chamber 5 along the inclined discharge plate 37 under the scraping action of the scraper 36 and finally enters the interior of the impurity removal valve pipe 48 along the floating slag chamber 5 for recovery treatment. And in order to ensure that the clear water can directly enter the clear water chamber 6 through the water outlet hole 38, the bottom of the floating slag chamber 5 is inclined and the height value is less than the height of the partition 51 between the separation chamber 4 and the clear water chamber 6. Moreover, the water outlet hole 38 is located below the floating slag chamber 5. Therefore, the floating slag above the separation chamber 4 directly enters the interior of the floating slag chamber 5 for recovery under the scraping action of the scraper 36, and the clear water below the separation chamber 4 passes over the lower part of the floating slag chamber 5 and enters the clear water chamber 6 through the water outlet hole 38 to wait for subsequent treatment.

[0039] The mounting bracket 45 is fixedly connected above the inclined discharge plate 37 and has an inverted L-shaped structure. The mounting bracket 45 mainly serves for fixed installation. And the mounting bracket 45 is located above the scum chamber 5, thus preventing the scum inside the scum chamber 5 from directly splashing and entering the inside of the clean water chamber 6 after being elastically scraped by the scraper 36 and reaching above the inclined discharge plate 37, that is, the mounting bracket 45 mainly functions like a mudguard. The disassembly plate 46 is movably connected below the mounting bracket 45 and scrapes and cleans the outer surface of the scraper 36. A T-shaped block is provided at the top of the disassembly plate 46, while a T-shaped groove is provided at the bottom of the mounting bracket 45. The T-shaped block and the T-shaped groove are in sealing sliding fit with each other to achieve the quick disassembly and replacement effect of the disassembly plate 46. And the position of the disassembly plate 46 matches the end position of the conveyor belt 33. That is, when the telescopic part 24 drives the conveyor belt 33 to move upward to the maximum value, the scraper 36 rotates to a horizontal state and presses against the bottom of the disassembly plate 46. And as the scraper 36 is driven to scrape, the scraping surface of the scraper 36 can directly press against the bottom of the disassembly plate 46 and scrape and clean each other, thus preventing the scraper 36 from reciprocatingly scraping and causing pollution to the subsequent process.

[0040] The coking phenol-cyanide sewage treatment system further includes: a fixing plate 39, which is arranged inside the partition 51 between the scum chamber 5 and the clean water chamber 6 on the side close to the clean water chamber 6. The fixing plate 39 has an L-shaped structure, that is, the clean water inside the separation chamber 4 first enters the inside of the fixing plate 39 for diversion through the water outlet 38. The drain port 40 is opened above the inside of the fixing plate 39. Then when the amount of clean water inside the fixing plate 39 continuously rises and reaches the position of the drain port 40, the clean water directly passes over the drain port 40 and reaches the inside of the clean water chamber 6 for recovery. At the same time, the height of the diversion plate 22 is lower than that of the drain port 40. Therefore, by means of the principle of communicating vessels, the liquid level height inside the flotation tank 1 matches the drainage height of the drain port 40. Furthermore, by adjusting the height value of the drain port 40, the liquid level height value inside the flotation tank 1 can be adjusted.

[0041] Specifically, a movable plate 41 is hermetically and movably connected inside the discharge port 40. The moving distance of the movable plate 41 inside the discharge port 40 changes the opening size of the discharge port 40 and is used to adjust the liquid level height inside the flotation tank 1. The inner wall of the discharge port 40 is symmetrically provided with concave chutes, and the inner wall of the concave chute is hermetically and slidably connected to the outer surface of the movable plate 41. This setting mainly ensures that no matter how far the movable plate 41 moves up and down inside the discharge port 40, the movable plate 41 still blocks the lower part of the discharge port 40. The clear water inside the fixed plate 39 can only pass through the upper part of the movable plate 41 through the discharge port 40 and enter the clear water chamber 6. That is, when the movable plate 41 moves upward, the blocking area of the movable plate 41 for the discharge port 40 increases, the height value of the discharge port 40 rises, and the liquid level height inside the flotation tank 1 rises synchronously. A threaded sleeve 43 is provided on the side wall of the movable plate 41, and a threaded rod 42 is threadedly connected inside the threaded sleeve 43. A cross frame 52 is provided on the top of the mounting plate 39 and above the discharge port 40, and an adjustment motor 44 is provided on the top of the cross frame 52. The bottom output end of the adjustment motor 44 is fixedly connected to the top of the threaded rod 42. The threaded rod 42 passes through the inside of the cross frame 52. That is, when the adjustment motor 44 is started and the output end rotates forward, the adjustment motor 44 drives the threaded rod 42 to rotate forward. The threaded rod 42 is threadedly connected to the threaded sleeve 43 and drives the movable plate 41 to move upward. The blocking area of the movable plate 41 for the discharge port 40 increases, the height value of the discharge port 40 rises, and the liquid level height value inside the flotation tank 1 rises.

[0042] A recovery valve pipe 47 is provided below the clear water chamber 6. A concentration sensor is provided inside the recovery valve pipe 47 and is used to detect the impurity concentration in the clear water. With the help of the concentration sensor, the impurity concentration in the clear water can be accurately obtained, so as to correspondingly adjust the scraping depth of the scum, further realizing the adaptability and accuracy of scraping.

[0043] And impurity removal valve pipes 48 are provided inside the remaining mixing chamber 2, flotation chamber 3 and separation chamber 4. Each impurity removal valve pipe 48 is normally in a closed state. After flotation is completed, the impurity removal valve pipe 48 is opened, and the impurities or sewage remaining inside the mixing chamber 2, flotation chamber 3 and separation chamber 4 are directly discharged along the impurity removal valve pipe 48 and recycled, further facilitating the subsequent cleaning and impurity removal effect inside.

[0044] A ladder 7 is provided on one side of the flotation tank 1. The setting of the ladder 7 facilitates the operator to observe the situation inside the flotation tank 1 in real time. At the same time, a controller is provided on the side wall of the flotation tank 1, and the controller electrically controls each electrical component.

[0045] In use, first, the controller controls the opening of the recovery valve pipe 47 and the impurity removal valve pipe 48. The medicine tank part 11 works and feeds the flocculant into the inside of the water inlet pipe 12. At the same time, the pump body inside the water inlet pipe 12 starts and feeds the sewage and the flocculant into the mixing chamber 2. The stirring motor 14 inside the mixing chamber 2 starts and the bottom output end drives the rotating rod 15 to rotate. The rotating rod 15 drives a plurality of blades 16 to rotate and fully and effectively mix and stir the sewage and the flocculant inside the mixing chamber 2, so that the flocculant and the sewage are fully combined and the impurities in the sewage are flocculated into larger impurities, facilitating the subsequent flotation process.

[0046] After that, the sewage and larger impurities inside the mixing chamber 2 enter the flotation chamber 3 through the bottom perforation 50. At the same time, the air compressor 8 starts to pass air or ozone etc. through the inside of the dissolved air tank 9, and the dissolved air water pump 21 starts and feeds the clear water inside the clear water chamber 6 into the dissolved air tank 9 along the return pipe 10. The dissolved air tank 9 processes the air or ozone and the clear water etc. and generates dissolved air water. The dissolved air water uniformly enters the inside of the shunt pipe 18 along the air supply pipe 17 and finally sprays out through the ejector 19 and the nozzle 20 above the shunt pipe 18. The dissolved air water sprayed out by the nozzle 20 adsorbs and floats up with the larger impurities inside the flotation chamber 3, so that the impurities and the clear water in the sewage are separated, ensuring the quality of the subsequent clear water.

[0047] The larger impurities after flotation above the flotation chamber 3 form scum. After being shunted by the shunt plate 22, the scum reaches above the separation chamber 4, while the clear water is located below the separation chamber 4 after passing through the shunt plate 22, thus achieving the effect of stratified flow. Then, the controller controls the driving motor 29 to start and drives the driving gear 30 to rotate. The driving gear 30 drives the driven gear 31 to rotate through the chain 28. The driven gear 31 drives the central shaft 32 to rotate. The central shaft 32 synchronously drives the conveyor belts 33 on both the front and rear sides to rotate synchronously. The conveyor belts 33 drive the scraper 36 to rotate through the mounting blocks 34 and the splicing frames 35. The scraper 36 drives and scrapes the scum above the separation chamber 4.

[0048] That is, when the scraper 36 is located below the conveyor belt 33, the scraper 36 is in the same direction as the flow direction of the scum and the clear water inside the separation chamber 4. And because the driving speed of the scraper 36 is greater than the flow speed of the scum and the clear water, the scraper 36 scrapes the scum above the separation chamber 4 along the inclined discharge plate 37 into the scum chamber 5. The scum inside the scum chamber 5 continuously flows obliquely downward into the impurity removal valve pipe 48 for recovery treatment. When the scraper 36 continues to rotate and reaches below the mounting frame 45, the scraping surface of the scraper 36 comes into extrusion contact with the outer surface of the disassembly plate 46, and then the disassembly plate 46 is used to scrape and clean the scum attached to the outer surface of the scraper 36. The scraped scum falls downward into the scum chamber 5 for recovery treatment, further realizing the cleanliness and impurity-free property of the scraper 36 after scraping the scum, and preventing the scraper 36 from continuing to convey with the conveyor belt 33 and polluting the subsequent scum inside the separation chamber 4.

[0049] The clear water inside the separation chamber 4 continuously reaches the inside of the fixing plate 39 after passing through the water outlet hole 38 below the scum chamber 5. The amount of clear water inside the fixing plate 39 continuously rises and reaches the end of the flow discharge port 40. At this time, the movable plate 41 is located at a suitable position inside the flow discharge port 40. Then, the clear water passes through the flow discharge port 40 above the movable plate 41 and enters the inside of the clear water chamber 6. The clear water inside the clear water chamber 6 is recycled along the recycling valve pipe 47. The concentration sensor inside the recycling valve pipe 47 detects that the concentration value of the clear water reaches the preset concentration value, and the flotation tank 1 continuously and stably performs the flocculation, flotation, and scum scraping processes on the sewage.

[0050] When the amount of scum inside the separation chamber 4 is too large, even after being scraped by the scraper 36, there is still some scum in the clear water entering the inside of the clear water chamber 6 along the water outlet hole 38. When the clear water inside the clear water chamber 6 is discharged through the recycling valve pipe 47, the concentration value detected by the concentration sensor inside the recycling valve pipe 47 increases and is greater than the set concentration preset value. This indicates that the liquid level inside the separation chamber 4 is too low or the amount of scum scraped by the scraper 36 above the separation chamber 4 is reduced. Therefore, the controller controls the regulating motor 44 to start and the output end rotates forward to drive the threaded rod 42 to rotate forward. The threaded rod 42 is in threaded cooperation with the threaded sleeve 43 and drives the movable plate 41 to move upward inside the flow discharge port 40, and the blocking area below the movable plate 41 for the flow discharge port 40 increases.

[0051] The flowing height of the clear water inside the fixing plate 39 above the flow discharge port 40 rises. Then, by virtue of the principle of communicating vessels, the liquid level height inside the flotation tank 1 correspondingly rises, and the scum height above the separation chamber 4 correspondingly rises. When the scraper 36 continuously drives and scrapes, the amount of scum scraped above the separation chamber 4 correspondingly rises, further reducing the amount of impurities in the clear water entering the inside of the clear water chamber 6 from the separation chamber 4. The concentration value detected by the concentration sensor inside the recycling valve pipe 47 gradually decreases to the initial value.

[0052] At the same time, when the concentration value detected by the concentration sensor inside the recycling valve pipe 47 decreases and is less than the set concentration preset value, it indicates that the liquid level inside the separation chamber 4 is too high or the amount of scum scraped by the scraper 36 inside the separation chamber 4 increases. As a result, it is easy for some clear water inside the separation chamber 4 to enter the scum chamber 5 along with the scraper 36 for recycling. In this process, not only the recycling amount of the clear water is reduced and the treatment amount of the scum is correspondingly increased, but also the scraper 36 is easily damaged due to long-term deep scraping inside the separation chamber 4.

[0053] Then the controller controls the motor 44 to reverse, and the output end drives the threaded rod 42 to rotate in the reverse direction. The threaded rod 42 is in threaded cooperation with the threaded sleeve 43 and drives the movable plate 41 to move downward along the drainage port 40. The blocking area below the drainage port 40 by the movable plate 41 is reduced, and the liquid level drops correspondingly when the clear water inside the mounting plate 39 passes above the drainage port 40. Then the liquid level inside the flotation tank 1 drops, and the scraping depth decreases when the scraper 36 drives and scrapes the scum above the separation chamber 4. Correspondingly, the scraping amount of the scum above the separation chamber 4 decreases. All the clear water inside the separation chamber 4 can be completely and effectively discharged into the clear water chamber 6 through the water outlet holes 38 for subsequent treatment. The concentration value detected by the concentration sensor inside the recovery valve pipe 47 continuously increases to the set concentration preset value, further ensuring the scraping and separation effect of the clear water and the scum.

[0054] By detecting the concentration value of the clear water through the concentration sensor inside the recovery valve pipe 47, the quality of the clear water can be obtained quickly and efficiently, and the height value of the movable plate 41 inside the drainage port 40 can be adjusted correspondingly, so as to adjust the liquid level height value inside the flotation tank 1, further ensuring that the scraper 36 can completely and effectively scrape and clean the scum above the separation chamber 4 and ensuring the quality of the recovered clear water. Embodiment 2

[0055] Based on the technical solution described in Embodiment 1, during the actual flotation process of sewage, frequently adjusting the height value of the movable plate 41 inside the drainage port 40 is likely to cause changes in the liquid level height inside the flotation tank 1. Not only does the liquid level rise and fall with a time delay, but it also affects the mixing and stirring of the front-end sewage and the flocculant as well as the flotation effect of the dissolved air water. At the same time, when the amount of scum above the separation chamber 4 changes, the attached area of the scum on the outer surface of the scraper 36 changes correspondingly when the scraper 36 scrapes the scum. At this time, if the scraping distance of the dismountable plate 46 on the outer surface of the scraper 36 cannot be adjusted correspondingly, it is likely that some of the scum on the outer surface of the scraper 36 cannot be effectively cleaned, which affects the scraping of the scum inside the subsequent separation chamber 4. And when the amount of scum inside the separation chamber 4 changes, as the scraper 36 continuously drives and scrapes the scum above the separation chamber 4, the amount of scum accumulated at the end of the scraper 36 continuously increases. At this time, if the scraping depth of the scraper 36 cannot be adjusted correspondingly, it is likely that some of the scum above the separation chamber 4 collide with each other, causing the tiny bubbles to break away, or some of the scum flows back to the lower part of the separation chamber 4 along the lower part of the scraper 36, reducing the scraping effect. When the scraper 36 rotates continuously with the conveyor belt 33 and returns above the separation chamber 4, the scraper 36 collides with the clear water and scum inside the separation chamber 4 under the action of inertia, resulting in the scum being squeezed and contacted on the outer surface and the clear water inside the separation chamber 4 being turbulent. Eventually, the tiny bubbles on the outer surface of the scum break, causing impurities to fall into the clear water and causing pollution.

[0056] Therefore, according to the above process, when the concentration value detected by the concentration sensor inside the recovery valve pipe 47 increases and is greater than the set concentration preset value, it indicates that the liquid level in the separation chamber 4 decreases and the amount of scum scraped by the scraper 36 above the separation chamber 4 decreases. Then the controller controls the activation of multiple telescopic parts 24 and the output ends shorten. The output ends of the telescopic parts 24 drive the follower plate 25 to move downward. The follower plate 25 synchronously drives the scraper 36 to move downward through the conveyor belt 33 and the splicing frame 35 above. When the scraper 36 is located below the conveyor belt 33 with the continuous transmission of the conveyor belt 33, the depth of the scraper 36 inserted into the separation chamber 4 increases. Then the amount of scum scraped by the scraper 36 above the separation chamber 4 increases, further ensuring that all the scum inside the separation chamber 4 can enter the scum chamber 5 along the inclined discharge plate 37 and be thoroughly and effectively scraped, cleaned and recycled.

[0057] Meanwhile, as the conveyor belt 33 drives the scraper 36 to continuously move towards the scum chamber 5 end and scrape the scum above the separation chamber 4, and the clear water and scum inside the separation chamber 4 continuously move towards the scum chamber 5 end under their own flow action, the scum accumulated at the scraper 36 continuously increases. The controller controls the activation of the telescopic parts 24 and the output ends continuously shorten. The telescopic parts 24 drive the scraper 36 to continuously move downward through the follower plate 25 and the conveyor belt 33 above. The depth of the scraper 36 inserted into the separation chamber 4 continuously increases. Then the amount of scum scraped by the scraper 36 above the separation chamber 4 continuously increases, thus ensuring that all the scum above the separation chamber 4 can be thoroughly, effectively and stably scraped and recycled, effectively avoiding the mutual extrusion and crushing of some scum or the backflow of the scum along the lower part of the scraper 36 into the separation chamber 4 to reduce the scraping effect.

[0058] Meanwhile, if the concentration value detected by the concentration sensor is larger, the controller controls the output ends of the two telescopic parts 24 near the scum chamber 5 to shorten by a larger distance. Then the telescopic parts 24 drive the scraper 36 to move downward by a larger distance, while the output ends of the two telescopic parts 24 far from the scum chamber 5 extend by an unchanged distance. Then, under the driving action of the splicing frame 35, the depth of the scraper 36 inserted into the liquid level of the separation chamber 4 increases and the scraper 36 tilts. The tilt angle of the scraper 36 is between 30 degrees and 45 degrees, and the larger the concentration value detected by the concentration sensor, the larger the tilt angle of the scraper 36 within this range. The scum above the separation chamber 4 and the like can be more efficiently gathered and scraped at the end of the scraper 36, thus making it easier to collect the scum, reducing the sliding of the scum and reducing the disturbance to the liquid level. Finally, the scraper 36 contacts the inclined discharge plate 37 and pushes out all the scum inside the separation chamber 4, improving the scraping and recycling effect of the scum.

[0059] When the scraper 36 discharges the scum above the separation chamber 4 along the inclined discharge plate 37 into the scum chamber 5, the scraper 36 disengages from the inside of the separation chamber 4 and continues to rotate with the conveyor belt 33. At this time, since the depth of the scraper 36 inserted into the separation chamber 4 increases, the area of the scum attached to the outer surface of the scraper 36 increases. Then the controller controls the telescopic part 24 to start and the output end extends. The telescopic part 24 drives the scraper 36 to move upward by a greater distance through the follower plate 25 and the conveyor belt 33, and the increased distance is greater than the initial position. When the scraper 36 rotates upward with the conveyor belt 33, the extrusion contact position between the scraper 36 and the disassembly plate 46 changes, and the scraping distance and area of the outer surface of the scraper 36 by the disassembly plate 46 correspondingly increase, further ensuring that the disassembly plate 46 can thoroughly and effectively scrape and clean the scum and the like attached to the outer surface of the scraper 36, and avoiding the pollution of the clear water and scum when the scraper 36 is inserted into the separation chamber 4 due to the attachment of some scum and the like on the outer surface of the scraper 36.

[0060] After that, as the conveyor belt 33 continuously rotates, it drives the scraper 36 to reach above the separation chamber 4 away from the scum chamber 5. Under the rotation of the transmission gear 27, the conveyor belt 33 turns, and the conveyor belt 33 drives the scraper 36 to rotate downward synchronously through the mounting block 34 and the splicing frame 35. Due to inertia, the scraper 36 will impact and collide with the clear water and scum inside the separation chamber 4 and insert into them, thereby causing turbulence inside the separation chamber 4 and the fragmentation of the scum.

[0061] At this time, the controller controls the telescopic part 24 to start and the output end extends. The telescopic part 24 drives the scraper 36 to move upward through the follower plate 25 and the conveyor belt 33. And the scraper 36 rotates downward under the driving of the conveyor belt 33. Therefore, under the action of two opposite forces, the scraper 36 slowly inserts into the separation chamber 4, reducing the impact force on the clear water when the scraper 36 inserts into the separation chamber 4, and effectively avoiding the occurrence of turbulence inside the separation chamber 4, which causes the scum above to collide with each other and the fragmentation of the microbubbles.

[0062] At the same time, when the concentration value detected by the concentration sensor is larger, it indicates that the amount of scum above the separation chamber 4 is larger, and the collision force of the conveyor belt 33 driving the scraper 36 against the scum is greater. Therefore, the controller controls the telescopic part 24 to start and the output end extends by a greater distance. The telescopic part 24 drives the scraper 36 to move upward by a greater distance through the follower plate 25 and the conveyor belt 33. The upward movement and downward rotation of the scraper 36 offset each other less and less, and the collision and extrusion force of the scraper 36 on the scum above the separation chamber 4 becomes smaller and smaller, thus ensuring that the scum inside the separation chamber 4 can be floatingly recovered completely and stably, and effectively avoiding the occurrence of situations such as the microbubbles on the outer surface of the scum being crushed and falling due to the extrusion and expansion by the scraper 36.

[0063] Subsequently, the above process is continuously repeated to scrape and clean the scum inside the separation chamber 4. Similarly, when the concentration value detected by the concentration sensor decreases, the opposite steps of the above process can be followed, which will not be elaborated here. Moreover, the scum is recycled through the scum chamber 5 and the impurity removal valve pipe 48, while the clear water continues to enter the inside of the clear water chamber 6 through the water outlet holes 38 continuously and is finally discharged through the recycling valve pipe 47 and awaits subsequent treatment. When no more sewage is introduced into the water inlet pipe 12, the controller stops the operation of each device, opens the discharge valve pipe 49, discharges the remaining liquid inside the mixing chamber 2, the flotation chamber 3, and the separation chamber 4, and continues to pass clear water through the inside of the water inlet pipe 12. The clear water passes through the mixing chamber 2, the flotation chamber 3, the separation chamber 4, the scum chamber 5, and the clear water chamber 6 in sequence, thereby realizing the flushing and cleaning work inside the air flotation tank 1, effectively avoiding affecting the treatment of subsequent coking phenol-cyanide sewage.

[0064] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0065] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A treatment system for coking phenolic cyanide wastewater, comprising: Pretreatment stage, biochemical treatment stage and advanced treatment stage, wherein the pretreatment equipment includes: A flotation tank (1), which flotation-treats coking phenolic cyanide wastewater, and a mixing chamber (2), a flotation chamber (3), a separation chamber (4), a scum chamber (5) and a clear water chamber (6) are successively arranged inside the flotation tank (1); It is characterized in that: A scraper (36), which is movably connected above the separation chamber (4) and scrapes off scum; A recovery valve pipe (47), which is arranged below the clear water chamber (6). A concentration sensor is arranged inside the recovery valve pipe (47) and is used to detect the impurity concentration in the clear water. When the concentration value detected by the concentration sensor is greater than the set concentration preset value, the scraping depth value of the scraper (36) for the scum inside the separation chamber (4) is adjusted to increase.

2. The treatment system for coking phenol-cyanide wastewater according to claim 1, wherein: A plurality of partition plates (51) are evenly arranged inside the flotation tank (1). The partition plates (51) are arranged between adjacent two chambers of the mixing chamber (2), the flotation chamber (3), the separation chamber (4), the scum chamber (5) and the clear water chamber (6) and are used to divide each chamber. A plurality of bottom perforations (50) are evenly opened below the partition plate (51) between the mixing chamber (2) and the flotation chamber (3). The bottom perforations (50) are used to circulate the wastewater mixed with the flocculant inside the mixing chamber (2) to the bottom of the flotation chamber (3). A flow dividing plate (22) is arranged above the partition plate (51) between the flotation chamber (3) and the separation chamber (4). The flow dividing plate (22) divides the flotation scum and clear water. A plurality of water outlet holes (38) are evenly opened below the partition plate (51) between the scum chamber (5) and the clear water chamber (6). The water outlet holes (38) are used to allow the clear water below the separation chamber (4) to enter the clear water chamber (6) along the lower part of the scum chamber (5) for subsequent treatment.

3. The treatment system for coking phenol-cyanide wastewater according to claim 1, characterized in that: It further includes: An inlet pipe (12), the inside of which circulates wastewater and the output end is connected to the inside of the mixing chamber (2) through a pump body; A medicine tank part (11), which is arranged on one side of the flotation tank (1) and the flocculant inside it is connected to the inside of the inlet pipe (12) through a pump body at the output end; A dissolved air tank (9), which is arranged on one side of the flotation tank (1) and injects dissolved air water into the flotation chamber (3). One end of the dissolved air tank (9) is connected to the output end of an air compressor (8), and the other side of the dissolved air tank (9) is connected to a reflux pipe (10) through a dissolved air water pump (21). The other end of the reflux pipe (10) is connected to the inner bottom of the clear water chamber (6).

4. The treatment system for coking phenol-cyanide wastewater according to claim 1, characterized in that: It further includes: Rotating rods (15), a plurality of which are arranged and are all movably connected inside the mixing chamber (2). The top of the rotating rod (15) is provided with a stirring motor (14), and the circumferential side of the stirring motor (14) is fixedly connected to the top of the flotation tank (1) through a bracket (13); Blades (16), multiple of which are provided and are all movably connected to the outer surface of the rotating rod (15), and the rotating rod (15) drives the blades (16) to rotate and uniformly mix the sewage and flocculant inside the mixing chamber (2).

5. The treatment system for coking phenol-cyanide wastewater according to claim 3, wherein: It further includes: Injectors (19), multiple of which are provided and are all located at the inner bottom of the flotation chamber (3). The bottoms of the multiple injectors (19) are interconnected through a shunt pipe (18), and the center of the shunt pipe (18) is connected to the output end of the dissolved air tank (9) through an air supply pipe (17); Nozzles (20), multiple of which are provided and are evenly distributed at the output end of the injector (19). The dissolved air water inside the injector (19) is evenly ejected along the nozzles (20) and flotation is carried out on the sewage inside the flotation chamber (3).

6. The treatment system for coking phenol-cyanide wastewater according to claim 1, wherein: On both sides of the air flotation tank (1), multiple side plates (23) are evenly provided. A telescopic part (24) is provided at the top of the side plate (23). The top output end of the telescopic part (24) is provided with a follower plate (25). The telescopic part (24) is activated to drive the follower plate (25) to move up and down. A splicing frame (35) is movably connected above the follower plate (25). The splicing frame (35) is installed and connected to a scraper (36), and the scraper (36) moves synchronously with the splicing frame (35).

7. The treatment system for coking phenol-cyanide wastewater according to claim 6, wherein: A driving motor (29) is provided at the top of one side of the follower plate (25). The output end of the driving motor (29) is provided with a driving gear (30). The top of the follower plate (25) is rotatably connected to a central shaft (32) through a bearing seat (26). Multiple transmission gears (27) are evenly provided on the outer surface of the central shaft (32). The outer surfaces of two transmission gears (27) on the same side are drivingly connected by a conveyor belt (33). The bottom of the splicing frame (35) is inserted and drivingly connected to the conveyor belt (33) through a mounting block (34). The rotation of the central shaft (32) drives the conveyor belt (33) to rotate through the transmission gears (27), and the conveyor belt (33) drives the scraper (36) to rotate. A driven gear (31) is provided on the outer surface of the central shaft (32) on one side, and the outer surfaces of the driving gear (30) and the driven gear (31) are drivingly connected by a chain (28).

8. The treatment system for coking phenol-cyanide wastewater according to claim 2, wherein: It further includes: Inclined discharge plate (37), which is located on the side of the partition plate (51) between the separation chamber (4) and the scum chamber (5) close to the separation chamber (4). The inclined discharge plate (37) is inclined to separate scum and clear water; Scum removal valve pipe (48), which is connected to one end of the scum chamber (5) and discharges scum; Mounting frame (45), which is fixedly connected above the inclined discharge plate (37) and has an inverted L-shaped structure; Demountable plate (46), which is movably connected below the mounting frame (45) and scrapes and cleans the outer surface of the scraper (36).

9. The treatment system for coking phenol-cyanide wastewater according to claim 2, wherein: It further includes: Fixed plate (39), which is arranged inside the partition plate (51) between the scum chamber (5) and the clear water chamber (6) close to the side of the clear water chamber (6); Discharge port (40), the discharge port (40) is opened above the inside of the fixed plate (39), a movable plate (41) is hermetically and movably connected inside the discharge port (40), the moving distance of the movable plate (41) inside the discharge port (40) changes the opening size of the discharge port (40), and is used to adjust the liquid level height inside the air flotation tank (1).

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