A pretreatment device and pretreatment method for high-concentration phenolic wastewater

Abstract

The present invention belongs to the technical field of wastewater treatment, and relates to a pretreatment device and a pretreatment method for high-concentration phenolic aldehyde-containing wastewater, including an organic frame. A treatment tank is connected to the frame. A heater is installed at the lower part of the treatment tank. A drain pipe is communicated with the bottom of the treatment tank. A cylinder one is installed on the treatment tank. The movable end of the cylinder one is connected with a connecting rod one. A sieve plate that is slidably arranged inside the treatment tank is connected to the connecting rod one. A cylinder two is installed on the treatment tank. The movable end of the cylinder two is connected with a connecting rod two that slidably penetrates through the sieve plate. The bottom side of the connecting rod two abuts against and blocks the inlet end of the drain pipe. A filter plate one is connected to the lower end of the connecting rod two. After the acid condensation reaction of the phenolic aldehyde-containing wastewater is completed, only by controlling the cylinder one can the wastewater be automatically and synchronously discharged, the phenolic aldehyde resin precipitate be removed, and the excess wastewater be extruded. Each step is interrelated and coordinated with each other, with high automation and synchronism, and it is convenient to classify and treat large-particle impurities and phenolic aldehyde resin precipitate.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and more specifically, relates to a pretreatment device and a pretreatment method for high-concentration phenolic aldehyde-containing wastewater. Background Art

[0002] Phenolic aldehyde generally refers to a class of resins or plastics prepared by the polymerization reaction of phenol and formaldehyde. When many thermal insulation materials are shaped, a large amount of phenolic resin needs to be sprayed and cured by heating. During the production process, a large amount of waste gas will be generated, and the waste gas contains pollutants such as a small amount of free phenol, free aldehyde, and particulate matter.

[0003] The commonly used disposal process is to filter the waste gas and then remove it through a wet electrostatic precipitator. A large amount of spray circulating water and offline flushing water are required during the operation of the wet electrostatic precipitator. Slowly, the concentration of organic substances such as phenol, aldehyde, and resin in the water will become higher and higher. Therefore, the wastewater must be effectively treated before it can be discharged. Summary of the Invention

[0004] The purpose of the present invention is to effectively treat phenolic aldehyde-containing wastewater, and provide a pretreatment device and a pretreatment method for high-concentration phenolic aldehyde-containing wastewater.

[0005] To solve the above technical problems, the present invention provides such a pretreatment device for high-concentration phenolic aldehyde-containing wastewater, including a machine frame. A circular treatment tank is connected to the machine frame. A heater for heating the inside of the treatment tank is installed at the lower part of the treatment tank. The heater is a constant-temperature heater. A drain pipe is connected to the bottom of the treatment tank. A cylinder one is installed on the treatment tank. The movable end of the cylinder one is connected to a connecting rod one in an L shape. A sieve plate slidably arranged inside the treatment tank is connected to the connecting rod one. The edge of the sieve plate bulges upward to form a large-particle impurity accommodating space. A cylinder two is installed on the treatment tank and is located on the right side of the cylinder one. The movable end of the cylinder two is connected to a connecting rod two that slidably penetrates through the center of the sieve plate. The bottom side of the connecting rod two abuts against and blocks the inlet end of the drain pipe. The lower end of the connecting rod two is connected to a filter plate one located below the sieve plate.

[0006] Preferably, it further includes a baffle plate. The sieve plate has a plurality of through holes one for the phenolic aldehyde-containing wastewater to pass through. Large-particle impurities in the phenolic aldehyde-containing wastewater with a diameter larger than the through holes one on the sieve plate one cannot pass through the through holes one on the sieve plate one. A sliding rod and a baffle plate located between the sieve plate and the filter plate one slide on a support shaft. The support shaft is a hollow structure. The sliding rod is embedded and slidably arranged on the support shaft. The sliding rod is connected to the baffle plate. A spring located inside the support shaft is connected between the upper side of the sliding rod and the support shaft. The spring is used to reset the support shaft after sliding. The baffle plate is provided with a plurality of through holes two for the phenolic aldehyde-containing wastewater to pass through. The through holes two on the baffle plate are staggered with the through holes one on the sieve plate in position.

[0007] Preferably, it further includes a first top column. The lower side of the sieve plate is connected with the same number of first top columns as that of the second through holes. The first top columns are adapted to penetrate into the second through holes. The upper side of the baffle is connected with the same number of second top columns as that of the first through holes. The second top columns are adapted to penetrate into the first through holes.

[0008] Preferably, it further includes a top plate. The connecting rod one is connected with a top plate that is slidably arranged inside the treatment tank. The top plate is located above the sieve plate. The upper part of the top plate penetrates through an exhaust pipe, a water inlet pipe and a feed pipe. Control valves are arranged inside both the water inlet pipe and the feed pipe. The water inlet pipe is used for supplying phenolic wastewater into the treatment tank, and the feed pipe is used for supplying acid catalyst into the treatment tank.

[0009] Preferably, it further includes a treatment frame. The treatment frame is connected with a partition plate that divides the interior of the treatment frame into a flocculation treatment space and a mixing space. A water pump is installed on the treatment frame. The water inlet pipe of the water pump is communicated with the outlet end of the drain pipe. The water outlet pipe of the water pump is communicated with the flocculation treatment space of the treatment frame. The top and bottom of the flocculation treatment space inside the treatment frame are respectively communicated with a first inlet pipe and a first discharge pipe. The top and bottom of the mixing space inside the treatment frame are respectively communicated with a second inlet pipe and a second discharge pipe. An air delivery group that is jointly located in the flocculation treatment space and the mixing space is arranged on the treatment frame. A servo motor is installed on the treatment frame. A spiral stirring shaft located in the flocculation treatment space of the treatment frame is connected to the output shaft of the servo motor. Controlling the servo motor can drive the spiral stirring shaft to rotate to stir the wastewater. A water passing port is opened on the partition plate. A lifting plate slides on the water passing port of the partition plate. A cylinder three is installed on the treatment frame. The movable end of the cylinder three is connected with the lifting plate. A stirrer located in the mixing space is installed on the treatment frame.

[0010] Preferably, it further includes a collar. The treatment frame is connected with a collar located in the flocculation treatment space. The collar surrounds the spiral stirring shaft. A notch facing the lifting plate is opened on the collar. A sealing plate is connected between the collar and the treatment frame. The sealing plate is connected between the water passing port of the partition plate and the notch of the collar. The sealing plate separates the water passing port of the partition plate from the inner bottom of the treatment frame.

[0011] Preferably, it further includes a bidirectional lead screw. A bidirectional lead screw located inside the collar is rotatably arranged on the treatment frame. A second filter plate that slides inside the collar is threadedly connected to the bidirectional lead screw. A driven gear is connected to the bidirectional lead screw through a one-way clutch. Under the action of the one-way clutch, the driven gear will not drive the bidirectional lead screw to rotate when rotating counterclockwise. On the contrary, the driven gear will drive the bidirectional lead screw to rotate when rotating clockwise. A driving gear meshing with the driven gear is connected to the output shaft of the servo motor.

[0012] The present invention also provides a pretreatment method according to the above high-concentration phenolic wastewater pretreatment device, including:

[0013] S1) Through the action of heating and acid catalysis, phenol and formaldehyde in the phenolic wastewater are condensed to generate phenolic resin precipitation;

[0014] S2) Treat the phenolic resin precipitate and the remaining wastewater separately, and adjust the pH value of the remaining wastewater to neutral with an alkaline substance;

[0015] S3) Conduct flocculation treatment on the wastewater, and separate the flocs in the wastewater from the wastewater by filtration.

[0016] Preferably, it further includes:

[0017] S4) Incorporate the floc sludge and the like treated by flocculation in the wastewater into the raw materials for incineration;

[0018] S5) Adjust the pH value of the supernatant treated by flocculation in the wastewater to 7.

[0019] On the basis of overcoming the shortcomings of the prior art, the beneficial effects that the present invention can achieve are:

[0020] 1. After the acid condensation reaction of the phenolic wastewater is completed, only by controlling the first cylinder can the wastewater be automatically and synchronously discharged, the phenolic resin precipitate be removed, and the excess wastewater be extruded. Each step is interrelated and coordinated, with high automation and synchronism, and it is convenient to classify and treat large particle impurities and phenolic resin precipitate.

[0021] 2. The first top column will penetrate into the second through hole on the baffle, and the second top column is suitable for penetrating into the first through hole on the sieve plate, so as to automatically clean and avoid blockage. At the same time, it can also further improve the sealing effect between the sieve plate and the baffle, ensuring that all the excess wastewater can be discharged from the drain pipe during the extrusion process.

[0022] 3. In the treatment method, through a series of chemical and physical treatment steps such as heating, acid condensation, pH adjustment, flocculation, and separation, the organic load and pollutant concentration are effectively reduced, and at the same time, the purification and safe reuse of the water quality are realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the assembly schematic diagram of the present invention.

[0024] Figure 2 It is the top view of the present invention.

[0025] Figure 3 It is the front view of the present invention, in which the treatment tank and the treatment frame are in full section.

[0026] Figure 4 It is the schematic diagram of the first cylinder, sieve plate, second cylinder and first filter plate of the present invention.

[0027] Figure 5 It is the schematic diagram of the baffle, sliding rod and spring of the present invention.

[0028] Figure 6Schematic cross-sectional view of the support shaft of the present invention.

[0029] Figure 7 Cross-sectional view of the sieve plate and baffle of the present invention.

[0030] Figure 8 Schematic view of the processing frame, gas delivery group and collar of the present invention.

[0031] Figure 9 Front view of the present invention, with the collar in full section.

[0032] Figure 10 Schematic view of filter plate II, driven gear and driving gear of the present invention.

[0033] The reference signs in the attached drawings provided by the present invention are: 1 - frame, 2 - processing tank, 20 - drain pipe, 21 - heater, 31 - cylinder I, 32 - connecting rod I, 33 - sieve plate, 330 - through hole I, 331 - top column I, 34 - top plate, 35 - exhaust pipe, 36 - water inlet pipe, 37 - feed pipe, 41 - cylinder II, 42 - connecting rod II, 43 - support shaft, 44 - filter plate I, 45 - baffle, 450 - through hole II, 451 - top column II, 46 - slide bar, 47 - spring, 51 - processing frame, 511 - discharge pipe I, 512 - discharge pipe II, 513 - inlet pipe I, 514 - inlet pipe II, 52 - water pump, 53 - partition plate, 60 - gas delivery group, 61 - servo motor, 62 - spiral stirring shaft, 63 - lifting plate, 64 - cylinder III, 71 - collar, 710 - notch, 72 - sealing plate, 81 - bidirectional lead screw, 82 - filter plate II, 83 - driven gear, 84 - driving gear, 91 - mixer. Detailed implementation manners

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. The technical solutions of the present invention will be clearly and completely described below with reference to the drawings. It should be noted that the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] A high-concentration phenolic wastewater pretreatment device, as Figures 1-4As shown in the figure, it includes a machine frame 1, a treatment tank 2 and a heater 21. A circular treatment tank 2 is connected to the machine frame 1. A heater 21 for heating the inside of the treatment tank 2 is installed at the lower part of the treatment tank 2. The heater 21 is a constant temperature heater 21. A drain pipe 20 is communicated with the bottom of the treatment tank 2. A first cylinder 31 is installed on the treatment tank 2. The movable end of the first cylinder 31 is connected with a first connecting rod 32 in an L shape. A sieve plate 33 slidably arranged inside the treatment tank 2 is connected to the first connecting rod 32. The edge of the sieve plate 33 bulges upward to form a large particle impurity accommodation space. Pour the phenolic wastewater to be treated into the treatment tank 2. The sieve plate 33 will preliminarily screen the phenolic wastewater, and large particle impurities will be retained on the sieve plate 33. A second cylinder 41 located on the right side of the first cylinder 31 is installed on the treatment tank 2. The movable end of the second cylinder 41 is connected with a second connecting rod 42 slidably penetrating through the center of the sieve plate 33. The bottom side of the second connecting rod 42 abuts and blocks the inlet end of the drain pipe 20. When the second connecting rod 42 moves upward, the inlet end of the drain pipe 20 will be released, thereby opening the drain pipe 20. The lower end of the second connecting rod 42 is connected with a first filter plate 44 located below the sieve plate 33. The phenolic wastewater passing through the sieve plate 33 will fall onto the first filter plate 44 at the bottom of the treatment tank 2. At this time, start the heater 21 to heat the phenolic wastewater in the treatment tank 2, and add an acidic catalyst (the acidic catalyst can be hydrochloric acid or sulfuric acid) into the treatment tank 2. Under heating and acid catalysis, phenol and formaldehyde in the phenolic wastewater will condense to form phenolic resin precipitation. At the same time, urea can also be added to the treatment tank 2 as needed for urea-formaldehyde condensation, so as to pre-treat the phenolic wastewater. After the condensation reaction is completed, control the second cylinder 41 to drive the second connecting rod 42 to drive the generated phenolic resin precipitation to move upward from the wastewater through the first filter plate 44. At the same time, the second cylinder 41 will also drive the second connecting rod 42 to move upward to release the inlet end of the drain pipe 20 to discharge the remaining wastewater. During the continuous upward movement of the filter plate 44, it will also drive the phenolic resin precipitation to be extruded with the sieve plate 33, so as to extrude the excess wastewater in the phenolic resin precipitation, facilitating the subsequent treatment process. During the whole process, after the acid condensation reaction of the phenolic wastewater is completed, only by controlling the first cylinder 31 can the wastewater be automatically and synchronously discharged, the phenolic resin precipitation be removed, and the excess wastewater be extruded. Each step is interrelated and coordinated, with high automation and synchronization. After the extrusion of the phenolic resin precipitation is completed, synchronously control the first cylinder 31 and the second cylinder 41 to drive the first connecting rod 32 and the second connecting rod 42 to move upward respectively. The first connecting rod 32 will drive the sieve plate 33 to move upward, and the second connecting rod 42 will drive the first filter plate 44 to move upward through the support shaft 43, so as to drive the phenolic resin precipitation to be completely removed outside the treatment tank 2 for treatment. At the same time, it is also convenient to classify and clean the large particle impurities screened out on the sieve plate 33 to avoid mixing the large particle impurities with the phenolic resin precipitation.

[0037] As Figures 3-6As shown in the figure, it further includes a baffle plate 45. The sieve plate 33 has a plurality of through holes one 330 for the phenolic wastewater to pass through. Large particle impurities in the phenolic wastewater with a diameter larger than the through holes one 330 on the sieve plate 33 cannot pass through the through holes one 330 on the sieve plate 33. A slide bar 46 and a baffle plate 45 located between the sieve plate 33 and the filter plate one 44 slide on the support shaft 43. The support shaft 43 is of a hollow structure. The slide bar 46 is embedded and slidably arranged on the support shaft 43. The slide bar 46 is connected to the baffle plate 45. A spring 47 located inside the support shaft 43 is connected between the upper side of the slide bar 46 and the support shaft 43. The spring 47 is used for the support shaft 43 after sliding to reset. The support shaft 43 will drive the baffle plate 45 to move through the spring 47 and the slide bar 46. The baffle plate 45 is provided with a plurality of through holes two 450 for the phenolic wastewater to pass through. The phenolic wastewater passing through the sieve plate 33 will also pass through the through holes two 450 on the baffle plate 45 and fall onto the filter plate one 44 at the bottom of the treatment tank 2 for heating and acid-catalyzed treatment. The through holes two 450 on the baffle plate 45 are staggered with the through holes one 330 on the sieve plate 33. When the acid-catalyzed treatment is completed and the control cylinder two 41 drives the support shaft 43 to drive the phenolic resin precipitate to move upward through the filter plate one 44, the support shaft 43 will also drive the baffle plate 45 to move upward. When the baffle plate 45 moves upward to contact the sieve plate 33 and under the blocking action of the sieve plate 33, the baffle plate 45 stops moving upward and the spring 47 deforms. And the continuous upward movement of the filter plate one 44 will drive the phenolic resin precipitate to be squeezed with the baffle plate 45. Since the through holes two 450 on the baffle plate 45 are staggered with the through holes one 330 on the sieve plate 33, at this time, the space between the baffle plate 45 and the sieve plate 33 is sealed. Therefore, part of the excess wastewater extruded from the phenolic resin precipitate will not flow above the sieve plate 33, ensuring that all the excess wastewater can be discharged from the drain pipe 20 during the extrusion process.

[0038] As Figure 7 shown, it further includes a top column one 331. The lower side of the sieve plate 33 is connected with the same number of top columns one 331 as the through holes two 450. The top columns one 331 are adapted to penetrate into the through holes two 450. The upper side of the baffle plate 45 is connected with the same number of top columns two 451 as the through holes one 330. The top columns two 451 are adapted to penetrate into the through holes one 330. In this way, during the process of the baffle plate 45 moving upward and approaching the sieve plate 33, the top columns one 331 on the sieve plate 33 will penetrate into the through holes two 450 on the baffle plate 45, and the top columns two 451 on the baffle plate 45 are adapted to penetrate into the through holes one 330 on the sieve plate 33, so as to automatically clean and avoid the occurrence of blockage phenomenon. At the same time, it can also further improve the sealing effect between the sieve plate 33 and the baffle plate 45.

[0039] As Figures 1-3As shown in the figure, it further includes a top plate 34. A connecting rod 32 is connected to a top plate 34 that is slidably arranged inside the treatment tank 2. The top plate 34 is located above the sieve plate 33. An exhaust pipe 35, a water inlet pipe 36, and a feed pipe 37 penetrate through the upper part of the top plate 34. Control valves are built into both the water inlet pipe 36 and the feed pipe 37 to control the opening and closing of the water inlet pipe 36 and the feed pipe 37. The exhaust pipe 35 is connected to a condenser through an external hose. In this way, when heating and acid-catalyzing the phenolic wastewater, not only can phenolic resin precipitate be recovered, but also low-boiling organic substances condensed by the condenser can be recovered. The water inlet pipe 36 is used to supply phenolic wastewater into the treatment tank 2, and the feed pipe 37 is used to supply acid catalyst into the treatment tank 2. When the control cylinder 31 drives the connecting rod 32 to move upward, the connecting rod will drive the exhaust pipe 35, the water inlet pipe 36, and the feed pipe 37 to move upward through the top plate 34, facilitating the opening of the treatment tank 2 and the removal of phenolic resin precipitate.

[0040] As Figure 2 and Figure 8As shown, it further includes a processing box 51. A partition plate 53 is connected to the processing box 51, which divides the interior of the processing box 51 into a flocculation treatment space and a blending space. A water pump 52 is installed on the processing box 51. The water inlet pipe of the water pump 52 is connected to the outlet end of the drain pipe 20, and the water outlet pipe of the water pump 52 is connected to the flocculation treatment space of the processing box 51. The wastewater that has undergone heating and acid-catalyzed treatment in the treatment tank 2 will flow into the flocculation treatment space through the drain pipe 20 and the water pump 52. An inlet pipe 513 and a discharge pipe 511 are respectively connected to the top and bottom of the flocculation treatment space in the processing box 51. An inlet pipe 514 and a discharge pipe 512 are respectively connected to the top and bottom of the blending space in the processing box 51. Since the wastewater is strongly acidic, lime milk is first added to the wastewater in the flocculation treatment space through the inlet pipe 513 to adjust the pH value to an appropriate range to promote subsequent chemical reactions. An air delivery group 60 is provided on the processing box 51 and is located in both the flocculation treatment space and the blending space. A servo motor 61 is installed on the processing box 51, and a spiral stirring shaft 62 located in the flocculation treatment space of the processing box 51 is connected to the output shaft of the servo motor 61. Controlling the servo motor 61 can drive the spiral stirring shaft 62 to rotate and stir the wastewater. After the pH value of the wastewater is adjusted, ferrous ions (Fe2+) and hydrogen peroxide (H2O2) are added to the wastewater in the flocculation treatment space through the inlet pipe 513. They can generate strongly oxidizing hydroxyl radicals in an acidic environment, and these radicals can effectively oxidize and degrade organic pollutants in the water, including phenols and aldehydes. During this process, controlling the air delivery group 60 to input ozone into the wastewater for aeration treatment can increase the dissolved oxygen content in the wastewater, which helps the oxidation reaction to proceed. Finally, a flocculant is added to the wastewater in the flocculation treatment space through the inlet pipe 513 to help small suspended particles aggregate into larger flocs, facilitating subsequent solid-liquid separation operations. A water passing port is opened on the partition plate 53, and a lifting plate 63 slides on the water passing port of the partition plate 53. A cylinder 64 is installed on the processing box 51, and the movable end of the cylinder 64 is connected to the lifting plate 63. A stirrer 91 located in the blending space is installed on the processing box 51. When the flocs in the wastewater during flocculation treatment have settled well, controlling the cylinder 64 to drive the lifting plate 63 to move upward to open, so that the clear water can flow into the blending space through the partition plate 53. Then, controlling the cylinder 64 to drive the lifting plate 63 to move downward to close, and adjusting the pH value of the supernatant in the blending space of the processing box 51 to neutral through the inlet pipe 514, making it suitable for reuse or other purposes, and ensuring that the water discharged from the discharge pipe 512 will not cause corrosion and other problems to the environment or equipment.

[0041] As Figure 8 and Figure 9As shown, it further includes a collar 71. A collar 71 located in the flocculation treatment space is connected to the treatment frame 51. The collar 71 surrounds the spiral stirring shaft 62. When the spiral stirring shaft 62 rotates, the wastewater in the flocculation treatment space will disperse within the collar 71, improving the treatment effect of the wastewater within the collar 71. A notch 710 facing the lifting plate 63 is formed on the collar 71. A sealing plate 72 is connected between the collar 71 and the treatment frame 51. The sealing plate 72 is connected between the water passing port of the partition plate 53 and the notch 710 of the collar 71. The sealing plate 72 separates the water passing port of the partition plate 53 from the inner bottom of the treatment frame 51. In this way, after flocculation treatment, the relatively clear water within the collar 71 can flow into the mixing space of the treatment frame 51 through the notch 710 and the sealing plate 72 from the water passing port of the partition plate 53, preventing the flocs at the inner bottom of the treatment frame 51 from flowing into the mixing space of the treatment frame 51.

[0042] As Figure 9 and Figure 10 shown, it further includes a bidirectional lead screw 81. A bidirectional lead screw 81 located within the collar 71 is rotatably connected to the treatment frame 51. A second filter plate 82 that slides within the collar 71 is threadedly connected to the bidirectional lead screw 81. A driven gear 83 is connected to the bidirectional lead screw 81 through a one-way clutch. Under the action of the one-way clutch, the counterclockwise rotation of the driven gear 83 will not drive the bidirectional lead screw 81 to rotate. On the contrary, the clockwise rotation of the driven gear 83 will drive the bidirectional lead screw 81 to rotate. A driving gear 84 meshing with the driven gear 83 is connected to the output shaft of the servo motor 61. When the servo motor 61 drives the spiral stirring shaft 62 to rotate clockwise for stirring, the driven gear 83 will not drive the bidirectional lead screw 81 to rotate. When the flocs during the flocculation treatment of the wastewater have settled well and it is necessary to lift and open the lifting plate 63, first control the servo motor 61 to drive the spiral stirring shaft 62 to rotate counterclockwise. The servo motor 61 will drive the driven gear 83 to rotate clockwise through the driving gear 84, and the driven gear 83 will drive the second filter plate 82 to move downward through the bidirectional lead screw 81, so that the second filter plate 82 blocks below the notch 710 of the collar 71, further preventing the sediment from floating up and passing through the notch 710 of the collar 71. When the second filter plate 82 moves downward to the threshold value, the continuous rotation of the bidirectional lead screw 81 can cause the second filter plate 82 to move upward and reset.

[0043] A pretreatment method for the high-concentration phenolic wastewater pretreatment device according to the above, including:

[0044] S1) Through the action of heating and acid catalysis, the phenol and formaldehyde in the phenolic wastewater are condensed to form phenolic resin precipitation;

[0045] S2) Treat the phenolic resin precipitation and the remaining wastewater separately, and use an alkaline substance to adjust the pH value of the remaining wastewater to neutral;

[0046] ] S3) Perform flocculation treatment on the wastewater, and filter and separate the flocs and the wastewater in the wastewater.

[0047] It also includes:

[0048] S4) Incorporate the flocculated sludge and the like treated from the wastewater into the raw materials for incineration (the "raw materials" generally refer to those industrial raw materials that can be used as fuels or auxiliary materials. These raw materials can be diverse, depending on the design and treatment capacity of the incineration facility), which can recover energy and reduce pollution;

[0049] S5) Adjust the pH value of the supernatant treated by flocculation in the wastewater to 7 and continue to reuse it.

[0050] [[ID=IO]]Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all the embodiments. It only expresses the preferred implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention.

[0051] It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations, quantity increases or decreases, improvements and substitutions can be made. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention. It should be noted that there is a small error in the original text. In the translation of , "IO" should be "10". The above translation has been corrected accordingly.

Claims

1. A pretreatment device for high-concentration phenolic wastewater, comprising an organic frame (1), a treatment tank (2) is connected to the frame (1), a heater (21) is installed at the lower part of the treatment tank (2), a drain pipe (20) is communicated with the bottom of the treatment tank (2), and it is characterized in that, It further includes a first cylinder (31). The first cylinder (31) is installed on the treatment tank (2). The movable end of the first cylinder (31) is connected to a first connecting rod (32). A sieve plate (33) that slides inside the treatment tank (2) is connected to the first connecting rod (32). A second cylinder (41) is installed on the treatment tank (2). The movable end of the second cylinder (41) is connected to a second connecting rod (42) that slidably penetrates the sieve plate (33). The bottom side of the second connecting rod (42) abuts and blocks the inlet end of the drain pipe (20). A first filter plate (44) is connected to the lower end of the second connecting rod (42); It further includes a baffle plate (45). The sieve plate (33) has a plurality of first through holes (330). A slide rod (46) and a baffle plate (45) located between the sieve plate (33) and the first filter plate (44) slide on the support shaft (43). The slide rod (46) is connected to the baffle plate (45). A spring (47) is connected between the slide rod (46) and the support shaft (43). A plurality of second through holes (450) are formed in the baffle plate (45). The second through holes (450) in the baffle plate (45) are staggered with the first through holes (330) on the sieve plate (33); It further includes a first top column (331). The lower side of the sieve plate (33) is connected to the same number of first top columns (331) as the second through holes (450). The first top columns (331) are adapted to penetrate into the second through holes (450). The upper side of the baffle plate (45) is connected to the same number of second top columns (451) as the first through holes (330). The second top columns (451) are adapted to penetrate into the first through holes (330).

2. The pretreatment device for high-concentration phenolic wastewater according to claim 1, wherein, It further includes a top plate (34). A top plate (34) that slides inside the treatment tank (2) is connected to the first connecting rod (32). The top plate (34) is located above the sieve plate (33). An exhaust pipe (35), a water inlet pipe (36), and a feed pipe (37) penetrate through the upper part of the top plate (34). Control valves are built in both the water inlet pipe (36) and the feed pipe (37). The water inlet pipe (36) is used to supply phenolic wastewater into the treatment tank (2), and the feed pipe (37) is used to supply an acid catalyst into the treatment tank (2).

3. A pretreatment device for high-concentration phenolic wastewater according to claim 2, characterized in that, It further includes a processing box (51). A partition plate (53) is connected to the processing box (51), which divides the interior of the processing box (51) into a flocculation treatment space and a mixing space. A water pump (52) is installed on the processing box (51). The inlet pipe of the water pump (52) is communicated with the outlet end of the drain pipe (20), and the outlet pipe of the water pump (52) is communicated with the flocculation treatment space of the processing box (51). The top and bottom of the flocculation treatment space in the processing box (51) are respectively communicated with an inlet pipe one (513) and a discharge pipe one (511). The top and bottom of the mixing space in the processing box (51) are respectively communicated with an inlet pipe two (514) and a discharge pipe two (512). An air delivery group (60) that is commonly located in the flocculation treatment space and the mixing space is provided on the processing box (51). A servo motor (61) is installed on the processing box (51), and a spiral stirring shaft (62) located in the flocculation treatment space of the processing box (51) is connected to the output shaft of the servo motor (61). A water passing port is opened on the partition plate (53), and a lifting plate (63) slides on the water passing port of the partition plate (53). A cylinder three (64) is installed on the processing box (51), and the movable end of the cylinder three (64) is connected to the lifting plate (63). A stirrer (91) located in the mixing space is installed on the processing box (51).

4. The pretreatment device for high-concentration phenolic wastewater according to claim 3, wherein It further includes a collar (71). A collar (71) located in the flocculation treatment space is connected to the processing box (51). The collar (71) surrounds the spiral stirring shaft (62). A notch (710) facing the lifting plate (63) is opened on the collar (71). A sealing plate (72) is connected between the collar (71) and the processing box (51). The sealing plate (72) is connected between the water passing port of the partition plate (53) and the notch (710) of the collar (71), and the sealing plate (72) separates the water passing port of the partition plate (53) from the inner bottom of the processing box (51).

5. The pretreatment device for high-concentration phenolic wastewater according to claim 4, characterized in that, It further includes a bidirectional lead screw (81). The bidirectional lead screw (81) is rotated on the processing box (51) and located inside the collar (71). A filter plate two (82) that slides inside the collar (71) is threadedly connected to the bidirectional lead screw (81). A driven gear (83) is connected to the bidirectional lead screw (81) through a one-way clutch. A driving gear (84) that meshes with the driven gear (83) is connected to the output shaft of the servo motor (61).

6. The pretreatment method of a high-concentration phenolic wastewater pretreatment device according to claim 5, characterized in that, It includes: S1) Through the action of heating and acid catalysis, phenol and formaldehyde in the phenolic wastewater are condensed to form phenolic resin precipitate; S2) Treat the phenolic resin precipitate and the remaining wastewater separately, and use an alkaline substance to adjust the pH value of the remaining wastewater to neutral; S3) Perform flocculation treatment on the wastewater, and separate the flocs and the wastewater in the wastewater by filtration.

7. The pretreatment method of a high-concentration phenolic wastewater pretreatment device according to claim 6, characterized in that, It further includes: S4) Incorporate the floc sludge treated from the wastewater into the raw materials for incineration; S5) Adjust the pH value of the supernatant treated by flocculation in the wastewater to 7.

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