Pretreatment device and pretreatment method for high-concentration phenolic wastewater

Abstract

The invention belongs to the technical field of wastewater treatment, and relates to a high-concentration phenolic aldehyde-containing wastewater pretreatment device and a pretreatment method.The high-concentration phenolic aldehyde-containing wastewater pretreatment device comprises a rack, a treatment tank is connected to the rack, a heater is installed on the lower portion of the treatment tank, the bottom of the treatment tank communicates with a drainage pipe, a first air cylinder is installed on the treatment tank, and the movable end of the first air cylinder is connected with a first connecting rod; a sieve plate slidably arranged in the treatment tank is connected to the first connecting rod, a second air cylinder is mounted on the treatment tank, a second connecting rod slidably penetrating through the sieve plate is connected to the movable end of the second air cylinder, the bottom side of the second connecting rod abuts against and blocks the inlet end of the drainage pipe, and a first filter plate is connected to the lower end of the second connecting rod. After the acid condensation reaction of the phenolic aldehyde-containing wastewater is finished, the wastewater can be automatically and synchronously discharged, the phenolic resin precipitate is moved out and the redundant wastewater is squeezed out only by controlling the air cylinder I, all the steps are mutually associated and coordinated, the automation and synchronism are high, and large-particle impurities and the phenolic resin precipitate are conveniently classified and treated.

Description

Technical Field

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

[0002] Phenolic resin generally refers to a type of resin or plastic made from phenol and formaldehyde through polymerization. When many thermal insulation materials are formed, a large amount of phenolic resin needs to be sprayed and cured by heating. During the production process, a large amount of waste gas is generated, which contains a small amount of pollutants such as free phenol, free formaldehyde and particulate matter.

[0003] The commonly used treatment process is to filter the exhaust gas and then remove it through a wet electrostatic precipitator. The wet electrostatic precipitator requires a large amount of spray circulating water and offline flushing water. Slowly, the concentration of organic matter 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-formaldehyde-containing wastewater and to provide a high-concentration phenolic-formaldehyde-containing wastewater pretreatment device and pretreatment method.

[0005] In order to solve the above technical problems, the present invention provides a high-concentration phenolic wastewater pretreatment device, which includes a frame, a circular treatment tank is connected to the 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, the bottom of the treatment tank is connected to a drain pipe, a cylinder 1 is installed on the treatment tank, the movable end of the cylinder 1 is connected to a connecting rod 1 in an L-shaped shape, the connecting rod 1 is connected to a sieve plate slidably arranged inside the treatment tank, the edge of the sieve plate protrudes upward to form a large particle impurity accommodating space, a cylinder 2 is installed on the treatment tank and is located on the right side of the cylinder 1, the movable end of the cylinder 2 is connected to a connecting rod 2 that slides through the center of the sieve plate, the bottom side of the connecting rod 2 abuts and blocks the inlet end of the drain pipe, and the lower end of the connecting rod 2 is connected to a filter plate 1 located below the sieve plate.

[0006] Preferably, a baffle is also included, the sieve plate has a plurality of through holes one for phenolic wastewater to pass through, large particles of impurities in the phenolic wastewater whose diameter is larger than the through hole one on the sieve plate one cannot pass through the through hole one on the sieve plate one, a sliding rod and a baffle located between the sieve plate and the filter plate one are slidably arranged on the 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, a spring located in 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, a plurality of through holes two are opened on the baffle for phenolic wastewater to pass through, and the through holes two on the baffle are staggered with the through holes one on the sieve plate.

[0007] Preferably, it also includes top column one, the lower side of the sieve plate is connected with the same number of top column one as the through hole two, and the top column one is suitable for penetrating into the through hole two, and the upper side of the baffle is connected with the same number of top column two as the through hole one, and the top column two is suitable for penetrating into the through hole one.

[0008] Preferably, it also includes a top plate, a connecting rod is connected to a top plate slidably arranged inside the treatment tank, the top plate is located above the sieve plate, an exhaust pipe, a water inlet pipe and a feed pipe are penetrated through the upper part of the top plate, the water inlet pipe and the feed pipe are both equipped with built-in control valves, the water inlet pipe is used to supply phenolic wastewater into the treatment tank, and the feed pipe is used to supply acid catalyst into the treatment tank.

[0009] Preferably, a processing frame is also included, the processing frame is connected to a partition that divides the interior of the processing frame into a flocculation processing space and a blending space, a water pump is installed on the processing frame, a water inlet pipe of the water pump is connected to the outlet end of the drain pipe, and a water outlet pipe of the water pump is connected to the flocculation processing space of the processing frame, the top and bottom of the flocculation processing space in the processing frame are respectively connected to an inlet pipe 1 and a discharge pipe 1, and the top and bottom of the blending space in the processing frame are respectively connected to an inlet pipe 2 and a discharge pipe 2; a gas transmission group located in the flocculation processing space and the blending space are provided on the processing frame, a servo motor is installed on the processing frame, an output shaft of the servo motor is connected to a spiral stirring shaft located in the flocculation processing space of the processing frame, and the servo motor is controlled to drive the spiral stirring shaft to rotate to stir the wastewater; a water outlet is provided on the partition, a lifting plate is slid on the water outlet of the partition, a cylinder 3 is installed on the processing frame, the movable end of the cylinder 3 is connected to the lifting plate, and a stirrer located in the blending space is installed on the processing frame.

[0010] Preferably, a collar is also included, and the processing frame is connected to a collar located in the flocculation processing space, the collar surrounds the spiral stirring shaft, and a notch is opened on the collar toward the lifting plate. A sealing plate is connected between the collar and the processing frame, and the sealing plate is connected between the water outlet of the partition and the notch of the collar, and the sealing plate separates the water outlet of the partition from the inner bottom of the processing frame.

[0011] Preferably, it also includes a bidirectional screw rod, a bidirectional screw rod located in a sleeve ring is rotated on the processing frame, a filter plate 2 sliding inside the sleeve ring is threadedly connected to the bidirectional screw rod, and a driven gear is connected to the bidirectional screw rod through a one-way clutch. Under the action of the one-way clutch, the counterclockwise rotation of the driven gear will not drive the bidirectional screw rod to rotate, and conversely, the clockwise rotation of the driven gear will drive the bidirectional screw rod to rotate, and the output shaft of the servo motor is connected to a driving gear meshing with the driven gear.

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

[0013] S1) condensing phenol and formaldehyde in the phenolic wastewater to generate phenolic resin precipitation by heating and acid catalysis;

[0014] S2) treating the phenolic resin precipitate and the remaining wastewater separately, and adjusting the pH value of the remaining wastewater to neutral using an alkaline substance;

[0015] S3) flocculating the wastewater, and filtering and separating the flocs and the wastewater in the wastewater.

[0016] Preferably, it also includes:

[0017] S4) adding the flocculent sludge obtained from the flocculation treatment in the wastewater into the raw materials for incineration;

[0018] S5) adjusting the pH value of the supernatant obtained from the flocculation treatment in the wastewater to 7.

[0019] The present invention overcomes the shortcomings of the prior art and can achieve the following beneficial effects:

[0020] 1. After the acid condensation reaction of phenolic wastewater is completed, only cylinder one is controlled to automatically and synchronously discharge the wastewater, remove the phenolic resin precipitate and squeeze out the excess wastewater. Each step is interrelated and coordinated with each other, with high automation and synchronization, and it is convenient to classify and process large particle impurities and phenolic resin precipitate.

[0021] 2. The top column 1 will penetrate into the through hole 2 on the baffle plate, and the top column 2 is suitable for penetrating into the through hole 1 on the screen plate, so as to automatically clean it and avoid blockage. At the same time, it can also further improve the sealing effect between the screen plate and the baffle plate, ensuring that all excess waste water in the extrusion process can be discharged from the drain pipe.

[0022] 3. The treatment method effectively reduces the organic load and pollutant concentration through a series of chemical and physical treatment steps such as heating, acid condensation, pH adjustment, flocculation, and separation, while achieving water purification and safe reuse. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0025] Figure 3 This is the front view of the present invention, wherein the processing tank and the processing frame are fully cut away.

[0026] Figure 4 It is a schematic diagram of cylinder one, screen plate, cylinder two and filter plate one of the present invention.

[0027] Figure 5 Schematic diagram of the baffle, slide bar and spring of the present invention.

[0028] Figure 6It is a schematic cross-sectional view of the support shaft of the present invention.

[0029] Figure 7 It is a cross-sectional view of the screen plate and the baffle plate of the present invention.

[0030] Figure 8 It is a schematic diagram of the processing frame, gas transmission group and sleeve ring of the present invention.

[0031] Fig. 9 It is the front view of the present invention, wherein the collar is fully cut away.

[0032] Fig.10 It is a schematic diagram of the filter plate 2, the driven gear and the driving gear of the present invention.

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

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0035] In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. It should be noted that the technical features involved in the 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, such as Figure 1-Figure 4As shown, it includes a frame 1, a treatment tank 2 and a heater 21. The frame 1 is connected to a circular treatment tank 2. The lower part of the treatment tank 2 is equipped with a heater 21 for heating the inside of the treatment tank 2. The heater 21 is a constant temperature heater 21. The bottom of the treatment tank 2 is connected to a drain pipe 20. A cylinder 31 is installed on the treatment tank 2. The movable end of the cylinder 31 is connected to an L-shaped connecting rod 32. The connecting rod 32 is connected to a sieve plate 33 slidably arranged inside the treatment tank 2. The edge of the sieve plate 33 protrudes upward to enclose a large particle impurity accommodating space. When the phenolic wastewater to be treated is poured into the treatment tank 2, the sieve plate 33 will preliminarily screen the phenolic wastewater, and the large particle impurities will be retained on the sieve plate 33, a cylinder 2 41 located on the right side of the cylinder 1 31 is installed on the treatment tank 2, and a connecting rod 2 42 is connected to the movable end of the cylinder 2 41 to slide through the center of the sieve plate 33, and the bottom side of the connecting rod 2 42 is blocked at the inlet end of the drain pipe 20. The upward movement of the connecting rod 2 42 will loosen the inlet end of the drain pipe 20, thereby opening the drain pipe 20, and the lower end of the connecting rod 2 42 is connected to a filter plate 1 44 located below the sieve plate 33. The phenolic wastewater passing through the sieve plate 33 will fall onto the filter plate 1 44 at the bottom of the treatment tank 2. At this time, the heater 21 is started to heat the phenolic wastewater in the treatment tank 2, and an acid catalyst (the acid catalyst can be hydrochloric acid or sulfuric acid) is added to the treatment tank 2. During the heating and acid catalysis, the phenolic wastewater in the treatment tank 2 is heated. Under the condition of condensation, phenol and formaldehyde in the phenolic wastewater will condense to form phenolic resin precipitate. At the same time, urea can be added to the treatment tank 2 as needed to carry out urea-formaldehyde condensation, so as to pre-treat the phenolic wastewater. After the condensation reaction is completed, the control cylinder 2 41 drives the connecting rod 2 42 to drive the generated phenolic resin precipitate to move out of the wastewater through the filter plate 1 44. At the same time, the cylinder 2 41 will also drive the connecting rod 2 42 to move up and loosen the inlet end of the drain pipe 20 to discharge the remaining wastewater, and the filter plate 1 44 will also drive the phenolic resin precipitate to squeeze with the screen plate 33 during the continued upward movement, thereby squeezing out the excess wastewater in the phenolic resin precipitate, which is convenient for subsequent treatment procedures. In the whole process, After the acid condensation reaction of the wastewater is completed, only the control cylinder 1 31 can automatically and synchronously discharge the wastewater, remove the phenolic resin precipitate and squeeze out the excess wastewater. The various steps are interrelated and coordinated with each other, with high automation and synchronization. After the extrusion of the phenolic resin precipitate is completed, the synchronous control cylinder 1 31 and the cylinder 2 41 respectively drive the connecting rod 1 32 and the connecting rod 2 42 to move up, the connecting rod 1 32 will drive the sieve plate 33 to move up, and the connecting rod 2 42 will drive the filter plate 1 44 to move up through the support shaft 43, thereby driving the phenolic resin precipitate to be completely removed from the treatment tank 2 for treatment. At the same time, it is also convenient to classify and clean the large particles of impurities screened out on the sieve plate 33 to avoid mixing the large particles of impurities with the phenolic resin precipitate.

[0037] like Figure 3-Figure 6As shown, it also includes a baffle 45, the sieve plate 33 has a plurality of through holes 330 for phenolic wastewater to pass through, and large particles of impurities in the phenolic wastewater with a diameter larger than the through hole 330 on the sieve plate 33 cannot pass through the through hole 330 on the sieve plate 33, a slide rod 46 and a baffle 45 located between the sieve plate 33 and the filter plate 44 are slidably arranged on the support shaft 43, the support shaft 43 is a hollow structure, the slide rod 46 is embedded and slidably arranged on the support shaft 43, the slide rod 46 is connected to the baffle 45, and a spring 47 located in the support shaft 43 is connected between the upper side of the slide rod 46 and the support shaft 43, the spring 47 is used to reset the support shaft 43 after sliding, and the support shaft 43 will drive the baffle 45 to move through the spring 47 and the slide rod 46, and the baffle 45 is provided with a plurality of through holes 450 for phenolic wastewater to pass through. The phenolic wastewater passing through the sieve plate 33 will also fall to the through hole 450 on the baffle 45. The filter plate 44 at the bottom of the treatment tank 2 is heated and acid-catalyzed. The through hole 450 on the baffle 45 is staggered with the through hole 330 on the sieve plate 33. When the acid-catalyzed treatment is completed, the control cylinder 41 drives the support shaft 43 to drive the phenolic resin precipitate to move upward through the filter plate 44. The support shaft 43 also drives the baffle 45 to move upward. When the baffle 45 moves up to contact with the sieve plate 33 and is blocked by the sieve plate 33, the baffle 45 stops moving upward, the spring 47 is deformed, and the filter plate 44 continues to move upward, which will drive the phenolic resin precipitate to be squeezed with the baffle 45. Since the through hole 450 on the baffle 45 is staggered with the through hole 330 on the sieve plate 33, the baffle 45 and the sieve plate 33 are sealed at this time. Therefore, part of the excess wastewater squeezed out of the phenolic resin precipitate will not flow into the top of the sieve plate 33, ensuring that all the excess wastewater in the extrusion process can be discharged from the drain pipe 20.

[0038] like Figure 7 As shown, it also includes a top column 331. The lower side of the sieve plate 33 is connected with the same number of top columns 331 as the through holes 450. The top columns 331 are suitable for penetrating into the through holes 450. The upper side of the baffle plate 45 is connected with the same number of top columns 451 as the through holes 330. The top columns 451 are suitable for penetrating into the through holes 330. In this way, when the baffle plate 45 moves closer to the sieve plate 33, the top columns 331 on the sieve plate 33 will penetrate into the through holes 450 on the baffle plate 45. The top columns 451 on the baffle plate 45 are suitable for penetrating into the through holes 330 on the sieve plate 33, thereby automatically cleaning and avoiding blockage. At the same time, the sealing effect between the sieve plate 33 and the baffle plate 45 can also be further improved.

[0039] like Figure 1-Figure 3As shown, it also includes a top plate 34, and a connecting rod 32 is connected to the top plate 34 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 are penetrated on the upper part of the top plate 34. Both the water inlet pipe 36 and the feed pipe 37 have built-in control valves. The opening and closing of the water inlet pipe 36 and the feed pipe 37 are controlled by the control valves, so that the exhaust pipe 35 is connected to the condenser through an external hose, so that when the phenolic wastewater is heated and acid-catalyzed, not only the phenolic resin precipitate can be recovered, but also the low-boiling point organic matter condensed by the condenser can be recovered. The water inlet pipe 36 is used to supply the phenolic wastewater to enter the treatment tank 2, and the feed pipe 37 is used to supply the acid catalyst to enter the treatment tank 2; and when the control cylinder 31 drives the connecting rod 32 to move upward, the connection will drive the exhaust pipe 35, the water inlet pipe 36 and the feed pipe 37 to move upward through the top plate 34, so as to open the treatment tank 2 and take out the phenolic resin precipitate.

[0040] like Figure 2 and Figure 8As shown, it also includes a processing frame 51, and a partition 53 is connected to the processing frame 51 to divide the interior of the processing frame 51 into a flocculation processing space and a harmonizing space. A water pump 52 is installed on the processing frame 51, and a water inlet pipe of the water pump 52 is connected to the outlet end of the drain pipe 20, and a water outlet pipe of the water pump 52 is connected to the flocculation processing space of the processing frame 51. The wastewater in the processing tank 2 that has been heated and acid-catalyzed will flow into the flocculation processing space through the drain pipe 20 and the water pump 52. The top and bottom of the flocculation processing space in the processing frame 51 are respectively connected to an inlet pipe 1 513 and an outlet pipe 1 511, and the top and bottom of the harmonizing space in the processing frame 51 are respectively connected to an inlet pipe 2 513 and an outlet pipe 2 511. 14 and the discharge pipe 2 512. Since the wastewater is strongly acidic, lime milk is first added to the wastewater in the flocculation treatment space through the inlet pipe 1 513 to adjust the pH value, and adjust its pH value to an appropriate range to promote the subsequent chemical reaction. The treatment frame 51 is provided with a gas transmission group 60 located in the flocculation treatment space and the blending space. The treatment frame 51 is equipped with a servo motor 61. The output shaft of the servo motor 61 is connected to a spiral stirring shaft 62 located in the flocculation treatment space of the treatment frame 51. The servo motor 61 is controlled to drive the spiral stirring shaft 62 to rotate to stir the wastewater. After the pH value of the wastewater is adjusted, the inlet pipe 1 513 is used to discharge the wastewater. Iron ions (Fe2+) and hydrogen peroxide (H2O2) are added to the wastewater in the flocculation treatment space. They can produce strong oxidizing hydroxyl radicals in an acidic environment. These free radicals can effectively oxidize and degrade organic pollutants in the water, including phenols and aldehydes. In this process, the gas transmission group 60 is controlled to aerate the wastewater with ozone to increase the dissolved oxygen content in the wastewater, which is conducive to the oxidation reaction. Finally, flocculants are added to the wastewater in the flocculation treatment space through the inlet pipe 513 to help small suspended particles aggregate into larger flocs, which is convenient for subsequent solid-liquid separation operations; a water outlet is opened on the partition 53, and the water outlet of the partition 53 is A lifting plate 63 is provided for sliding, and a cylinder three 64 is installed on the processing frame 51. The movable end of the cylinder three 64 is connected to the lifting plate 63. A stirrer 91 located in the blending space is installed on the processing frame 51. When the flocs in the wastewater are precipitated during the flocculation treatment, the cylinder three 64 is controlled to drive the lifting plate 63 to move up and open, so that clean water can flow into the blending space through the partition 53. Then the cylinder three 64 is controlled to drive the lifting plate 63 to move down and close. The pH value of the supernatant in the blending space of the processing frame 51 is adjusted to neutral through the entry pipe two 514, so that it is suitable for reuse or other purposes, ensuring that the water discharged from the discharge pipe two 512 will not cause corrosion to the environment or equipment.

[0041] like Figure 8 and Fig. 9As shown, it also includes a ring 71. The processing frame 51 is connected to the ring 71 located in the flocculation processing space. The ring 71 surrounds the spiral stirring shaft 62. The rotation of the spiral stirring shaft 62 will disperse the wastewater in the flocculation processing space in the ring 71, thereby improving the treatment effect of the wastewater in the ring 71. A notch 710 facing the lifting plate 63 is opened on the ring 71. A sealing plate 72 is connected between the ring 71 and the processing frame 51. The sealing plate 72 is connected between the water outlet of the partition 53 and the notch 710 of the ring 71. The sealing plate 72 separates the water outlet of the partition 53 from the inner bottom of the processing frame 51, so that after the flocculation treatment, the clearer water in the ring 71 can flow from the water outlet of the partition 53 into the harmonizing space of the processing frame 51 through the notch 710 and the sealing plate 72, thereby preventing the flocs at the bottom of the processing frame 51 from flowing into the harmonizing space of the processing frame 51.

[0042] like Fig. 9 and Fig.10 As shown, it also includes a bidirectional screw rod 81, a bidirectional screw rod 81 located in the collar 71 is rotated on the processing frame 51, a filter plate 82 that slides inside the collar 71 is threadedly connected to the bidirectional screw rod 81, and a driven gear 83 is connected to the bidirectional screw rod 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 screw rod 81 to rotate, and conversely, the clockwise rotation of the driven gear 83 will drive the bidirectional screw rod 81 to rotate. The output shaft of the servo motor 61 is connected to a driving gear 84 that meshes with the driven gear 83. When the servo motor 61 drives the spiral stirring shaft 62 to rotate clockwise for stirring, the driven gear 84 is engaged with the driven gear 83. The gear 83 will not drive the bidirectional screw 81 to rotate. When the flocs in the wastewater are settled during the flocculation treatment and the lifting plate 63 needs to be moved up to open, the servo motor 61 is first controlled to drive the spiral stirring shaft 62 to rotate counterclockwise, and 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 filter plate 2 82 to move down through the bidirectional screw 81, so that the filter plate 2 82 is blocked under the gap 710 of the ring 71, further preventing the sediment from floating up and passing through the gap 710 of the ring 71; and when the filter plate 2 82 moves down to the threshold, the bidirectional screw 81 continues to rotate to enable the filter plate 2 82 to move up and reset.

[0043] A pretreatment method according to the above-mentioned high-concentration phenolic wastewater pretreatment device comprises:

[0044] S1) condensing phenol and formaldehyde in the phenolic wastewater to generate phenolic resin precipitation by heating and acid catalysis;

[0045] S2) treating the phenolic resin precipitate and the remaining wastewater separately, and adjusting the pH value of the remaining wastewater to neutral using an alkaline substance;

[0046] S3) flocculating the wastewater, and filtering and separating the flocs and the wastewater in the wastewater.

[0047] Also included are:

[0048] S4) Adding flocculent sludge from flocculation treatment in wastewater to raw materials for incineration ("raw materials" usually refer to industrial raw materials that can be used as fuel or auxiliary materials. These raw materials can be varied, depending on the design and processing capacity of the incineration facility), which can recover energy and reduce pollution;

[0049] S5) adjusting the pH value of the supernatant obtained from the flocculation treatment in the wastewater to 7 for further reuse.

[0050] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. They only express the preferred implementation modes of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention.

[0051] It should be pointed out that, for ordinary technicians in this field, several modifications, increases and decreases in quantity, improvements and substitutions can be made without departing from the concept of the present invention. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

Claims

1. A high-concentration phenolic wastewater pretreatment device, comprising a frame (1), a treatment tank (2) connected to the frame (1), a heater (21) installed at the bottom of the treatment tank (2), and a drain pipe (20) connected to the bottom of the treatment tank (2), characterized in that: It also includes a cylinder (31), the cylinder (31) is installed on the treatment tank (2), the movable end of the cylinder (31) is connected to a connecting rod (32), the connecting rod (32) is connected to a sieve plate (33) slidably arranged inside the treatment tank (2), a cylinder (41) is installed on the treatment tank (2), the movable end of the cylinder (41) is connected to a connecting rod (42) slidably penetrating the sieve plate (33), the bottom side of the connecting rod (42) abuts against and blocks the inlet end of the drain pipe (20), and the lower end of the connecting rod (42) is connected to a filter plate (44).

2. A high-concentration phenolic wastewater pretreatment device according to claim 1, characterized in that: The filter further comprises a baffle (45), the sieve plate (33) having a plurality of through holes (330), a slide rod (46) sliding on the support shaft (43) and the baffle (45) located between the sieve plate (33) and the filter plate (44), the slide rod (46) being connected to the baffle (45), a spring (47) being connected between the slide rod (46) and the support shaft (43), a plurality of through holes (450) being opened on the baffle (45), and the positions of the through holes (450) on the baffle (45) and the through holes (330) on the sieve plate (33) being staggered.

3. A high-concentration phenolic wastewater pretreatment device according to claim 2, characterized in that: It also includes top pillars (331). The lower side of the sieve plate (33) is connected to the same number of top pillars (331) as the second through hole (450). The top pillars (331) are suitable for penetrating into the second through hole (450). The upper side of the baffle plate (45) is connected to the same number of top pillars (451) as the first through hole (330). The top pillars (451) are suitable for penetrating into the first through hole (330).

4. A high-concentration phenolic wastewater pretreatment device according to claim 1, characterized in that: The invention also comprises a top plate (34), the top plate (34) slidably arranged 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) are passed through the upper part of the top plate (34), the water inlet pipe (36) and the feed pipe (37) are both equipped with built-in control valves, 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).

5. A high-concentration phenolic wastewater pretreatment device according to claim 1, characterized in that: The processing frame (51) is also provided with a partition (53) which divides the interior of the processing frame (51) into a flocculation processing space and a blending space. A water pump (52) is installed on the processing frame (51). The water inlet pipe of the water pump (52) is connected to the outlet end of the drain pipe (20). The water outlet pipe of the water pump (52) is connected to the flocculation processing space of the processing frame (51). The top and bottom of the flocculation processing space in the processing frame (51) are respectively connected to an inlet pipe 1 (513) and an outlet pipe 1 (511). The top and bottom of the blending space in the processing frame (51) are respectively connected to an inlet pipe 2 (514) and an outlet pipe 3 (515). Two (512); a gas transmission group (60) located in the flocculation processing space and the blending space is provided on the processing frame (51); a servo motor (61) is installed on the processing frame (51); the output shaft of the servo motor (61) is connected to a spiral stirring shaft (62) located in the flocculation processing space of the processing frame (51); a water outlet is opened on the partition (53); a lifting plate (63) is slidably provided on the water outlet of the partition (53); a cylinder three (64) is installed on the processing frame (51); the movable end of the cylinder three (64) is connected to the lifting plate (63); and a stirrer (91) located in the blending space is installed on the processing frame (51).

6. A high-concentration phenolic wastewater pretreatment device according to claim 5, characterized in that: The invention also comprises a collar (71), the processing frame (51) is connected with the collar (71) located in the flocculation processing space, the collar (71) surrounds the spiral stirring shaft (62), 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 processing frame (51), the sealing plate (72) is connected between the water outlet of the partition (53) and the notch (710) of the collar (71), and the sealing plate (72) separates the water outlet of the partition (53) from the inner bottom of the processing frame (51).

7. A high-concentration phenolic wastewater pretreatment device according to claim 6, characterized in that: The invention also comprises a bidirectional screw rod (81), the processing frame (51) is provided with a bidirectional screw rod (81) which is located in the sleeve ring (71) and is rotatable, the bidirectional screw rod (81) is threadedly connected with a filter plate 2 (82) which slides inside the sleeve ring (71), the bidirectional screw rod (81) is connected with a driven gear (83) via a one-way clutch, and the output shaft of the servo motor (61) is connected with a driving gear (84) which meshes with the driven gear (83).

8. A pretreatment method for high-concentration phenolic wastewater pretreatment device according to claim 7, characterized in that: Included are: S1) condensing phenol and formaldehyde in the phenolic wastewater to generate phenolic resin precipitation by heating and acid catalysis; S2) treating the phenolic resin precipitate and the remaining wastewater separately, and adjusting the pH value of the remaining wastewater to neutral using an alkaline substance; S3) flocculating the wastewater, and filtering and separating the flocs and the wastewater in the wastewater.

9. The pretreatment method of a high-concentration phenolic wastewater pretreatment device according to claim 8, characterized in that: Also included are: S4) adding the flocculent sludge obtained from the flocculation treatment in the wastewater into the raw materials for incineration; S5) adjusting the pH value of the supernatant obtained from the flocculation treatment in the wastewater to 7.

Images